In the wake of the Third World War (lets use this instead of all the different names, if only because it covered the whole issue best), a whole new era dawned upon the world. The Age of Steam, subtly-started a few decades ago, now entered its prime, between British trains and steamers and the French artillery-haulers. Great advances were made every year in all spheres of science and technology, but especially in engineering and industry. From the military point of view, of particular importance was the development of the ironclad steamer and the tracked haulers ("universal trains"), which were now also used to transport troops and supplies. Though they would have to wait for decades until seeing use in actual warfare, these haulers performed well in the training maneuvers. The same went for the ironclads (which were developed separately by Britain and France; it must be noted that their military technology competition did much to encourage general progress).
The Third World War saw many features that were, though sometimes present in previous wars, never noticed on such a scale before. This primarily included the massive national conscription and economic mobilisation, the deployment of various new military technology (steamers, artillery-haulers, the Suez Canal, the flintlock rifles - especially "sharp" ones, i.e. these used by the British and Austrian sharpeshooters), and the French use of "la grande strategie" - massive, aggressive military operations and strategic-level maneuvers, backed up by an efficient comissariat and assisted by various unconventional methods (though the latter, most famously representated by the "partisans", was actually mostly used by the Poles in the late Polish campaign and by the Austrians during Erzherzog Karl's grand counter-offensive). Likewise, French operations in Prussia were marked down - erroneously - as the first instance of "total warfare" in world history. Lazare Carnot was particularily famous for his theories of "la guerre totale" and "la grande strategie", propagated in likewise-named books a few years after the war. Though the military old guard was outraged at his "unchivalrous" theories, the said guard had been thoroughly humbled and discredited by the war, and the new commanders, such as Napoleon Bonaparte and Erzherzog Karl, were more willing to listen to Carnot and other military theoreticians of the "new school". Military reforms were undertaken by many countries, based both on these theories and on the lessons learned during the war. Also, greater emphasis was now placed on the development of new military technologies, though in a way this has already been said in the previous paragraph. On a tactical level, a major change in attitude also took place during the war - a general shift favouring aggressiveness, as opposed to the previous, more conservative and cautious "cordon" tactics on the land and "line of battle" tactics on the sea.
Culturally, the Age of Steam was also the Age of Nationalism, or of Secondary/National Enlightenment as some call it. The Third World War had basically put an end to the old, Cosmopolitian Enlightenment; however, it would probably be more correct to say that it simply withered away during the late 18th/early 19th centuries, with the War only speeding up the process. It is not to say that a cultural dark age had come, ofcourse; simply one generation of philosophers and their pupils was replaced by a new generation that, while inheriting their ideals, changed them, sometimes beyond recognition. The Enlightenment achieved many of its goals, became unnecessary and so - died, or rather was replaced by the National Enlightenment; similariliy, the enlightened absolute monarchies had either succesfully been reformed into parliamentary or semi-parliamentary ones, either collapsed, either fell back into reaction. The defining trait of the Age of Nationalism was, ofcourse, nationalism - the growth of national consciousness in Europe. This not only hampered the previous spirit of cosmopolitianism, but also resulted in the integration of several national areas: this latter effect was especially noticeable in such culturally-decentralised areas as Germany, Scandinavia and the Byzantine Balkans. A brand of clerical nationalism grew increasingly powerful in France, despite Fouche's attempts to thwart it; a Spanish national revival also occured; and the earlier growth of a British (as opposed to English, Scottish or Irish) national identity, which continued into this era, is also often classed here. A proto-nationalist sentiment arose in Russia as well, though not all that strong outside of the heartlands. The nationalist movements weren't always succesful, especially there where they went against the local governments. Irish nationalism, as already implied, had pettered out. The Italian nationalists were confounded by the phenomenon of "pocket nationalism" - the growth of separate national indetities, especially in Naples (due to its Spanish ties and the status of a regional power in the Central Mediterranean) and Piedmont ("the Alpine kingdom", influenced by both the Swiss, the French and the Germans). Polish and Hungarian nationalists had achieved some degree of success in reviving the national consciousness, with particular emphasis on religion in both cases (probably a reaction to the Holy Roman Empire's secularity and anti-clericalism).
Europe was badly-shaken by the war. Much damage had been done to trade. The territories of the Holy Roman Empire (including the new gains) were lying in varying degrees of devastation and ruin. Virtually all of Europe had participated in the war, and as it was even more expensive than the previous ones, even such countries as Naples - that were basically untouched by the war itself, fighting at a comfortable distance - were left in war debt, the situation further worsened by the normal post-war recession. Thus the rest of the 1800s were spent on rest, reconstruction and reorganisation by most of the countries. This continued into 1810s, though by then the nations were naturally strenghthened, and free to involve themselves in colonial ventures - and certain major developments within Europe itself.
Meanwhile, in the greater world, European influence and power grew: early on in the shape of renewed Anglo-French dualism, and later in a somewhat more multilateral colonial competition with the resurgence of "alternative" European colonial powers. Nevertheless, several non-European states too had thrived and prospered in this era, playing the Europeans off against each other whilst reforming and modernising their nations to better face the challenges of the new age...
And now, in some more detail, we will go over these two decades and their "end products":
The war period saw the resolution of many issues that had dominated the British Commonwealth since the very Revolution of 1770. For one thing, the Battle of Salvora caused a revival of national pride and confirmed the renaissance of British sea power. At the same time, the British Atlantic victory was incomplete, while most remaining Indian ambitions had to be abandoned for good in the wake of Decaen's Franco-Mysorean invasion of Bengal. Yet by contrast, the gains made in the Pacific were much greater than either the losses elsewhere or the victories expected here. Though Pitt had fallen, his Pacific strategy had triumphed, as from Van Diemen's Land to Kamchatka and the Quadra Island, the British ruled supreme, and many other opportunities for expansion were only beginning to appear: Australia, Japan and Spanish America all looked promising. Thus Britain now was a confirmed great power, and furthermore, a great power with clear goals. Nevertheless, France remained a threat. Lastly, with the rise of the Washingtonian Republic, Britain's influence and interest in the eastern coast of North America diminished (much like France's, it must be admitted), but on the other hand the remaining east American colonies were fully integrated, their loyalty to the Commonwealth assured, especially as many of the frustrated, increasingly ostracised (for "selling Pennsylvania to French lackeys") New Englander radicals begun fleeing to the Republic. Similar developments took place in Ireland, where the anti-British party's collapse became apparent when it tried to force a rebellion upon Fouche's instigation; it didn't even get off the ground, and the increasingly-"Britified" Ireland became only closer to Birmingham, in fact becoming "more British than Britain itself" (some even proposed moving the capital to the British-majority Dublin, in the name of trans-Atlantic solidarity of the Commonwealth's core components - Britain, Ireland and New England). Meanwhile, it also became clear that innovation and industrialisation had paid off, and greater emphasis was placed on that. A series of crises in 1806 and 1807 saw the culmination of many long-standing political and social tensions, as Pitt the Younger's government fell, and John Cartwright formed a peculiar Radical-Moderate government. Whilst commanding loyal support amongst the more radical and liberal of the Moderates and the more moderate of the Radicals, Cartwright alienated both the conservative wing of the Moderates and the Radical die-hards. His control over and authority in his own Radical party disintegrated. As this became increasingly apparent, he decided upon a daring maneuver that destroyed the Two-Party system - declaring that if the Radicals don't want to follow him, he won't lead them, he stepped down, left the party and created the new "Reform Party", which was immediately joined by many of his supporters from both camps. Nevertheless, this gamble didn't pay off and in 1807 the Moderates came back to power under George Canning (who concentrated on foreign issues - distancing Britain from much of Europe (notably the HRE), but on the other hand confirming the alliance with Britain and establishing ties with several Russian governments as they replaced one another; thus Britain was able to concentrate on the colonial affairs, especially the "Pacific Project"). However, the Reformers retained great support and influence, and Cartwright became Prime Minister again in 1812, introducing a series of social reforms, most notably initiating a worker housing programme. As for the Radicals, they retreated into the fringe, though still maintaining a certain presence in the Parliament; some of them turned to illegal activism, trying to incite a revolution, with not much success apart from the occasional riot or assassination.
In many regards France was similar to Britain, yet in many others it differed. Here, too, the war resulted in a growth of national pride - but it was dimmed by the perceived "defeat without a defeat", as the nationalists had labelled the Paris Congress. Although in truth it was a victory - the Holy Roman Empire was put in its place and considerably weakened, Portugal, Belgium and most Italian states were all forced into the French diplomatic sphere, and French hegemony in the Indian Ocean was asserted - this national frustration continued to haunt Joseph Fouche for the rest of his political career, and in a way became his undoing. In any case, it was indeed true that the Central Powers had held, and thus there weren't many opportunities to pursue in Europe - and so, much like Britain, France initially concentrated on colonial pursuits, especially in the Indian Ocean where East Africa was conquered, a greater presence was set up in India with several new trade outposts and forts, and exploring other territories: this latter activity resulted in the establishment of French holdings in Dauphin-Terre (West Australia) and a few small Central Indian Ocean islands. Meanwhile, a general loosening of control occured in the Americas: Nouvelle France gained autonomy and near-free trade with other countries, while in the Carribean possessions a programme of gradual compensated emancipation of slaves was introduced, if only to rub the noses of the more-liberal-and-progressive-than-thou British into it, causing more intense debates between the emancipationists and the Moderates (ultimately, Prime Minister Cartwright introduced a similar programme in 1816, also placing restrictions on slave trade); basically, the French had mostly given up on the continent. Not so in Africa, where not only the last Omani colonies were grabbed, but also Senegal and Algiers colonies expanded and new ones founded in West and Central Africas. Meanwhile, in Europe, the French diplomats concentrated on playing people off against each other. Their efforts had mixed results in the end; while Russia and Byzantium ended up on the French side, Scandinavia was firmly aligned with Britain, while the Austro-Prussian alliance grew only stronger and closer. A new series of dramatic developments commenced in 1811, when Louis XVI finally died.
His son, Louis XVII, was far more strong-minded and independent; and so he resented the all-powerful Premier Joseph Fouche, who had by then gained so many enemies that he had to use blackmail, assassinations and so forth to maintain his power on a daily level. Although in this manner he had defeated a coup attempt on May 5th 1809 and attained de facto dictatorial powers in the aftermath, he himself already realised that by entrenching himself he had allowed his power to be under constant siege from all the factions of the political opposition. Not much of a fan of the parlementary system, Louis XVII did realise - if only because of Fouche's example - that it was possible to manipulate it to his means. In the Versailles, he carefully conspired with leaders of the First and Second Estates, with the Paris garrison, with the industrialists and the Physiocrats, gradually bringing those opposing factions together. Fouche, who had grown lax in the regards of the monarchy which he perceived to be powerless and discredited, was very surprised when after a faked assassination attempt Louis XVII moved to Tuileries, while the army occupied the streets and the Parlement refused to gather. Realising his situation to be dire, Fouche attempted to flee but was captured by the military patrols. Negotiating a truce with Louis XVII, he agreed to relinquish power and retire from political life; in the end, it was a honourable retire and a priveleged exile. Most of the French political world would greatly regret their decision to let Fouche go when a decade later his memoirs were published... but for now, it seemed that the all-powerful Premier, the head of the parliamentary police state, the head of the "Godless bourgoise", was firmly and perpetually "out". A huge political vacuum appeared; and it was filled in by Louis XVII, who again used the same factions that removed Fouche to assert control over France for himself. His uncle Charles d'Artois became the new Premier, to the dismay and outrage of the radicals and the republicans. The Ultramontanes asserted their power, and introduced measures that favoured the new state ideology of "clerical nationalism" - a product of fruitful "back-scratching" cooperation between the King and the Pope, who became and remained very close allies both politically and ideologically. A new emphasis on Catholicism was placed in education, missionaries were sent to the colonies (this provoked uprisings... precisely as was planned, for after those uprisings were defeated the various local religious leaders were physically removed), and in a full contrast to the Imperial ongoings the various "uncatholic" philosophers were actively persecuted; the Jews were mostly tolerated, but also limited in their progress. The Parlement's powers were gradually and carefully "redefined" - basically it became an advisory organ again, with great powers... and the unalienable rights of Royal Veto and Royal Prerogative. This shift coincided with the desamortisation in Spain and the secularisation in Naples; thus, in a supreme irony of history, the traditionally-clericalist Spain and the traditionally-secularist France changed their places, causing a north-south schism amongst the Bourbon powers, although in name at least the Family Compact was preserved. This was however a political change also (if anything, the disagreements on religion, though also important, were secondary from the historical viewpoint; rather, the main issue was that Spain grew increasingly independent in its foreign policies) - Spain, after its little coup d'etat, gradually switched towards a clearly more independent foreign policy and was generally supported by Naples and Portugal, while France retained the loyalty of the Papacy, Genoa and the Ultramontane Belgium. This diplomatic revolution caused major changes elsewhere; the French alliance with Russia was ultimately confirmed in exchange for Russian tolerance of Catholics and Uniates in their territory (this compromise was caused by greater necessity of such an alliance between the two countries), but the decline of French influence in the Mediterranean caused the Byzantine alignment with Spain (whilst France continued to ally with Egypt... even if the Egyptians thought it to be more of a blatant betrayal and conquest, but the heathens are always silly like that). Meanwhile, both Piedmont and Holland used this opportunity to leave the French block altogether, though their subsequent actions were rather different.
Yet it was not all loss for the French. The disintegration of the Bourbon Powers urged it to establish a greater decree of control over the Mediterranean. Using France's vast influence amongst the Knights Hospitaller and his own reputation and title of "Rex Christianissimus", he attained the status of Protector of the Order of the Knights of Saint John; while the Order ruled on in Malta and Tripolitania, it now ruled there in the name of King Louis XVII (and outside of any other French authority, it must be added; however, this status was a hereditary one). Meanwhile, as the situation in Egypt detiriorated after the death of Murad Bey in 1807, it was made even worse by French and Order proselytising efforts and the Byzantine invasion of the Levant. In 1814 the French had invaded Egypt and crushed the various warlords and heirs one-by-one with stunning ease and advancing down the Nile to assert control there. A slightly more difficult situation came in the Holy Land, but ultimately Pierre Dupont d'Etang defeated the outdated Byzantine army at Jaffa. A fully-fledged Franco-Byzantine (or even Mediterranean, as Spain finally dared to make its stance clear, launching the polarisation of the Bourbon powers along the lines already mentioned) war seemed to be a distinct possibility, but ultimately peac was signed; the Byzantines had to content themselves with Syria, Lebanon and pilgrim access to the holy sites in the Holy Land, which was placed under the Order's jurisdiction (whereas the rest of Egypt, plus Hejjaz, was put under the control of French colonial authorities, which tended to be more flexible and tolerant towards the Muslims, often working with their local leaders with the quiet consent of King Louis, who was at this point more pragmatical than fanatical). This conquest was of great value and revived French supremacy in the Mediterranean, although not an unchallenged one. The capture of Jerusalem was also lauded by the clerical propagandists: where Friedrich the Red-Bearded and Richard the Lion-Hearted had failed, Rex Christianissimus Louis XVII, the modern-day Saint Louis, had triumphed. Indeed, he had largely triumphed at home and abroad, and the Ultramontane France had weathered the storms. The radicals, humbled, were increasingly ostracised by king and country, and often fled abroad (the HRE being a surprisingly promising destination due to its anticlericalism, but Spain being even better in most cases as it actively invited French specialists in) or went into the underground, carrying out operations of agitation and individual terror. Those that remained in the Parlement were basically the ones that betrayed their causes, transforming into mild liberals - or, as was actually more widespread, attaining nobility and becoming die-hard reactionaries just as they were once die-hard revolutionaries (such political polarity is natural for certain temperaments). Abroad, the HRE, Spain and Britain were obvious opponents, yet none of them were openly hostile, or even necessarily enemies. And yet, Louis XVII couldn't but feel that his various enemies were conspiring against him... In the meantime, he rested and consolidated his gains, whilst modernising the French military.
In the face of the bitter ideological divides, the powerful modern technology and the theory of Total War, it was becoming increasingly obvious that any future European war would be far more horrible than any of those that had occured in the past... But this is a digression.
While the outcome of the Third World War for France was at worst dubious, for Spain the war was a definite defeat; the Spanish had failed to annex Portugal, to destroy British naval power or even to maintain control over the Philippines, which effectively meant the end of the serious Spanish presence in the Pacific (beyond the American coasts, anyway). The Spanish fleet, both commercial and military, was nearly crippled. Control over the colonies was disrupted by rebellions. Yet the situation in Spain itself was even worse, as the economy stumbled and the government united the society against it. Under government in this case we mean the royal favourite Manuel de Godoy, who held de facto absolute power in Spain. In the wake of the defeat and the socioeconomic crisis, Spain simply craved some sort of a change, which de Godoy was unwilling - and unable, for he had long since lost any real social support base - to provide. This seemed to be a pretty standard "hated minister" situation, but the issue was complicated by King Carlos IV's fanatical loyalty to his minister. Furthermore, whilst the lower classes mostly concentrated their hated on de Godoy, both the rising Spanish bourgoise and the liberal afrancesado noblemen and courtiers were increasingly opposed to Carlos IV for his complete incompetence. To many of them, it seemed that even if they could remove de Godoy without having to remove Carlos IV, it would only result in some other minister, or perhaps Carlos' domineering wife Maria Luisa, concentrating undue power over the weakling king - and thus, Spain - in their hands. Instead, many proposed a change of monarch, and the liberal, progressive, and at the same time independent infante Fernando became a natural leader for this faction. It also received clandestine British support and, via the liberal (or simply anti-Carlist) officerdom, the support of large segments of the army. On June 26th 1809, in a classical coup d'etat, Manuel de Godoy was arrested and incarcerated (later hanged - an unusual disgrace) by the Spanish army, and when Carlos tried to protest this he himself was declared mentally unfit to rule, and later allowed to move to Paris with his wife and retainers, living out the rest of his days in obscurity apart from a few unsavoury incidents of him trying to regain power, at the urging from Maria Luisa.
The Infante came to power as King Fernando VII. Immediately he had to secure his new position from hypothetic attacks from within and without; in that he was masterfully assisted by Don Miguel Ricardo de Alava, who travelled to Paris and there attained the French recognition of the new government (de Godoy's incompetence and corruption were so great that their benefits to France (namely, the comparative easiness with which de Godoy could be manipulated) were, it was thought, well outweighed by the negative impact they had on Spain in all other regards; and Fouche wasn't about to launch a war over some cretin Bourbon). Britain too was remarkably quick to recognise the new government. Having defeated a countercoup attempt, Fernando VII proceeded to reform the Cortes, expanding it and basically changing it into a semblance of the pre-1785 French Parlement (representative, but with social discrimination and the monarchy still retaining de jure absolute power). Though not very powerful, the Cortes proved a very important innovation as it basically allowed Fernando to properly assess the situation all over Spain's still-vast empire, and to pick out capable cadres to execute the reforms which he had decided upon. In this manner, he managed to introduce sweeping changes. The Spanish colonial empire was re-organised and decentralised, decreasing opportunities for abuse or betrayal amongst the local elites and the same time, with state investment and incentives, speeding up the development of the colonies. The tariff policy was not a one Fernando seemed to have a firm opinion about; at first he lowered them at the demands of the liberal bourgoise, but when the British threatened Spanish America with economic conquest he raised them heavily again, re-starting the Anglo-Spanish tariff war. Eventually a compromise was worked out and the tariffs went back to something like normal, the Spanish government investing heavily into Spain's own industrial development. All those investments were fruitful, but obviously drained the treasury, initiating the highly-controversial desamortisation - the large-scale confiscation of church property, combined with a general secularisation. That was not taken well at all in Spain, especially in Castille where a major rebellion forced Fernando to briefly flee to Seville in September 1815. The rebels invited Carlos IV to take back the throne, but the ex-king and his family were arrested again while trying to cross the border. Rallying his own troops, Fernando lifted the siege of Madrid and defeated the rebels in a key battle at Valladolid, yet his relations with the Pope and with France were never the same again. At this point the French had actually threatened intervention in the favour of the retreating rebels, but the clericalists were quickly finished off, while Britain officially declared that it intends to help defend Spanish sovereignity should it be threatened "by any third power". This, along with the Holy Land crisis, made the Franco-Spanish schism apparent, though not irreversable. Still, having covered his reform expenses, Fernando VII decided to capitalise on his military success by forcing through a land reform that finally ended serfdom. Though it was compensated in most areas, in Castille it was basically forceful and uncompensated except for those that remained actively loyal during the rebellion. This ensured the peculiar situation in which Castille, once Spain's heart, now became the center of opposition to central power - which still was wielded from Madrid (which, it must be noted, was by now quite liberal and Gallicised, and out of touch with its reactionary surroundings) - and more specifically, separatism, no doubt supported by the French. Aristocratic (and other, especially those of the various arcane economic organisations such as the Mesta) priveleges were curtailed, though not quite to the same extent as in France. In the sphere of economy, as already mentioned, the emphasis was placed on industrialisation and competing with the foreign traders; many of Fernando's economical reforms and policies were inspired by the writings of the late Pedro Rodriguez, Conde de Campomanes.
Lastly, in foreign affairs, Spain forged greater ties with Naples and Portugal, and another alliance with Byzantium, whilst continuing the reconciliation with Britain, signing the important Treaty of Seville in 1818 (which settled various Anglo-Spanish colonial, commercial and other disputes, chiefly in the Americas). Spain wasn't very expansionist in this time period; it still was busy consolidating and developing the vast amounts of land gained during the late 18th century landgrab in central North America; still, some parts of west Sahara were claimed during this time.