The first decade of the 19th century was filled with great social and ideological tension and conflict; with colonial expansion and consolidation; with economical reconfiguration, as trade routes and commerce priorities changed along with the very nature of economy (in Britain and France, at least); and lastly, with a growth of international tension, as a new alliance system emerged out of the confusion of Talleyrand's Diplomatic Revolution. Though in general, this decade could be described as that of "settling down", it still was chaotic and violent, though perhaps not as much as the 1790s.
Though some rebellions and assassinations ("terror from below") of this time, especially those in Western Europe, are rather more widely-known today (in Western Europe, anyway

), they were neither as famous in their own time nor as trully significant as the two big wars of these times.
Let us go not by the chronological order, and instead go by the geographical one. Ever since the 1783 Treaty of Paris, the United States of America had complicated relations with the UK and with France, but most importantly, with Spain. Aside from possible cooperation against some Amerind tribes and pretty limited commerce, USA had no real interests in common with Spain's, if only because the latter was pretty much impotent against Britain. Problematically, Spain was an ally of France, which, in turn, was a traditional ally of USA despite the presence of some complications here as well, as the Federalists - the American ruling party since independence - moved more and more towards a pro-British foreign policy, in part due to New England, the center of Federalist power, profiting first and foremost, from the trade with Britain. Meanwhile, the USA did have lots of problems WITH Spain - the usual border disagreements, aggravated by border clashes on the southern Georgian border and by Hamilton's centralization (and, some claim, provocation) efforts, the Spanish support for Amerind tribes fighting with the American settlers in the southwest, and, ofcourse, the issue of the Mississippi River waterway, which was controlled by Spain and through which the Americans wanted navigation rights.
Admittedly, all three questions were settled by the Treaty of San Lorenzo/Pinckney's Treaty as early as in 1795 - but they were settled on paper only. Border clashes only intensified after Hamilton became president, the Spanish still secretly assisted the Amerind resistors and as for the waterway, Manuel de Godoy - the Spanish prime minister and royal favourite - was increasingly in the support of curtailing the American navigation rights, or at least extracting more money from them for it. Spain's treasury was in a terrible shape.
In 1804, Spain took several measures to greatly raise the tariffs on trade with foreign powers in its American colonies, with an exception being made for France. But the French never did conduct much trade there; first and foremost this hurt the Americans and the British, the former as a small, yet ever-growing portion of American trade was going through the Mississippi and the Spanish port of New Orleans, the latter because of their great commercial infiltration of the Spanish colonial empire, especially since 1796. The Spanish ignored the diplomatic complaints, feeling safe behind the wall of the Basel Pact. Once Hamilton was succesfully reelected, he made good on his promises to remove and punish this injustice and to favourably revise the past settlement of the various issues with Spain. Both of these promises were sufficiently vague to pacify the anti-war and anti-British members of the Senate, as well as the Spaniards themselves - and to startle them a few days later when an alliance was negotiated (and forced through the Senate with some difficulty) with Britain and an united diplomatic front was formed againts Spain. Before the Spanish could properly react to this unexpected development, the Anglo-Americans already demanded removal of pretty much all tariffs (even earlier ones) aimed against them and Hamilton also proposed to buy the eastern parts of Louisiana, including, ofcourse, the River Mississippi itself. Godoy made the mistake of bluffing and rebuffing enemy demands; this was followed by a joint declaration of war. The few American settlers in Louisiana and just near it and/or Florida rose up and begun attacking Spaniards, and the American troops soon crossed the Mississippi to secure St. Louis and New Orleans. The British invaded Cuba and Buenos Aires, and crushed the Spanish navy at Golfo de Cadiz and another, lesser fleet at Great Inagua. The Spanish-American War, or the Mississippi War, had begun.
Now, ofcourse Godoy pleaded for French and Prussian help, but the Prussians couldn't care less and the French were not ready for war, busy fighting the Haitian slaves that took to hit-and-run attacks in the countryside and, though they didn't say so, utterly unwilling to ruin their relations with USA. Talleyrand proposed intermediation, but the Anglo-Americans ignored him as they landed blow after blow on the Spanish.
In 1805, the Spaniards gained a brief respite when diseases and skillful defenses made the British retreat from Cuba, while a desperate levy of militiamen forced the British out of Buenos Aires with much loss. That latter victory inspired the popular, ambitious viceroy of New Spain, Jose de Iturrigaray, to order levies of his own to reinforce the Spanish colonial armies that now couldn't be reinforced from Europe. This hadn't much positive effect in Louisiana, where the key population centers weren't Spanish at all and were in American hands in any case; in Florida, however, the levies, in combination with some volunteer brigades hastily formed out of runaway Georgian slaves and the Spanish Seminole allies, managed to incurr a humiliating defeat on the Americans at San Augustin. This respite was brief, almost immediately after a badly-organized Spanish army was defeated at Baton Rouge, while the British raided the Mexican coast and cut Florida's communications with Mexico as well as with Spain. In 1806 the British invaded southeastern Florida, while the Americans occupied West Florida and then moved into the north, with a fairly large (by American standards) army commanded by Andrew Jackson. The Spanish and the forces they have assembled resisted valorously, but were ultimately crushed.
This, and the death of Carlos IV back in Madrid (in part due to the stress of presiding over a painfully and irreversably declining empire), was the end of it, really. Fernando VII had no intentions of fighting an unwinnable war; he also hated Godoy, and so he had him imprisoned and later executted, while Fernando's mother and Godoy's lover Queen Maria Luisa was sent into a convent. Then he pinned the blame for everything on them and signed the humiliating Treaty of the Escorial, removing most tariffs impairing foreign trade in the Spanish colonial empire, paying out reparations to the UK and the USA, recognizing the Malvinas as British and returning Minorca to Britain. As for the Americans, to them he had to cede Louisiana in its entirety, as well as Florida, though he did manage to get the Americans to renounce all claims on Tejas and other territories officially recognized as part of the Vice-Royalty of New Spain. This victory confirmed Alexander Hamilton's popualrity and reinforced his policies of centralization and nationalism, as the USA was doubled in size and tripled in pride, while the economy prospered. It also cemented the Anglo-American alliance and destroyed the Franco-American one, while making Spain grow even more dependant on the French support. Pitt the Younger's government celebrated this diplomatic victory; now the Basel Pact was countered in the Americas and the Atlantic.
The other important war was ofcourse the Russo-Turkish one, yet another in the series many, started using the distraction of the other European powers. Pavel I had not counted on the Great French War ending so quickly, but nonetheless, ofcourse, he did not disengage his troops. He was quite correct in assuming that nobody was either ready or willing to challenge his present war; the French were busy recovering and intriguing against each other, while the British and the Austrians, the other two powers, wanted Russia as an ally and accordingly kept Prussia in check; not that the Prussians felt ready to challenge the Russian Empire, back then in one of its best days. Later on, the Austrians even entered the war on the Russian side, while the British, not involving themselves in the war, secretly leaned on the Ottoman government and "persuaded" it, eventually, to sign peace.
As for the war itself, it went smoothly. Sultan Selim III's reform efforts brought little result apart from further undermining the Ottoman authority in the Balkans and demoralizing the troops. Alexandru Ypsilanti - the twice-deposed prince of Wallachia, and once so of Moldavia - managed to organize a rebellion of Greek patriots, more liberale elements of the Romanian nobility and the desperate, starving Romanian peasantry. This rebellion was promptly backed by the Russians. A large army, commanded by the disgraced, but now once more recalled great Feldmarschall Aleksandr Suvorov, crossed the Dniester and in short order routed the weak Ottoman forces at Leova and at Buzau Pass. Alexandru Ypsilanti was proclaimed the prince of both Moldavia and Wallachia, and promptly placed under the Russian military protection. Meanwhile, in the Caucasus, Kartli likewise accepted the Russian protectorate (and was annexed a year later anyway due to the death of its last king) and allowed the Russians to push the Ottomans out of most of Georgia, threatening Kars. All the Ottoman counterattack attempts failed badly, and the Ottoman fleet was shattered in the naval battle at Nos Kaliakra, north of Varna in 1800. In 1801, as Russian forces advanced into Serbia and Bulgaria, Austria joined the war effort as well; repelled from Belgrade, the Austrians nonetheless occupied Bosnia and Herzegovina. Revolts flared up in Serbia, and minor ones in Greece; disappointed with the Greeks (who in turn were still disillusioned with the cynical betrayal of the "Orlov Revolt" in one of the previous Russo-Turkish wars), Pavel I and Franz II decided to accept the British-proposed peace in 1802. The Ottoman Empire was forced to cede sovereignity over the Danubean Principalities, which now became the United Principalities of Wallachia and Moldavia, over to the Russian Empire and its protectorate. It also lost Georgian, Abkhazian and Circassian lands to Russia and Bosnia and Herzegovina to Austria. Serbia became an autonomous principality under Karađorđe Petrović, vaguely aligned with Austria and Russia. And, ofcourse, Russian got right of passage through the Straits. Selim III had no choice but to agree, ofcourse.
This action had pushed the Ottomans - unofficially - into the French sphere of interest and alliance, and the British were quite aware of it; but here, too, they won a great victory, for Russia was now on their side. They did however realize that they might come to regret this later - Austria, weakened by its past defeats militarilly and politically, clearly became Russia's lesser partner now; in its difficult present geopolitical situation, Austria increasingly had to subordinate its foreign policies to the ones of Russia.
Both of these wars also had numerous influences on the development of military doctrine and technology in early 19th century. For instance, aerial reconaissance and the semaphore code - both of which were already in use in France and to a lesser extent in several other countries - were now employed by all the western great powers, from USA to Russia. The death of the positionary warfare predominant since the days of Vauban was complete as well. Ordnance and transportation were improved, better rifles and cannons were created (or, rather, they were designed earlier and now tested and adapted as weapons). The Anglo-American alliance was a change in and of itself; it guaranteed British naval supremacy further, as did the victory at Golfo de Cadiz, whilst the Americans grew less concerned about naval warfare, with their naval enemy number one turned into an ally. Ironically, both the British and the Americans suffered in the technological field because of this; the British, growing arrogant due to their now-unchallangeable naval supremacy, no longer cared much for innovation in that field (discarding, amongst other things, Congreve's designs for war rockets that were seen as a waste of money). The American government also no longer seeked various ingenious ways to thwart the British naval supremacy, as it was a good thing now. The French, on the other hand, despaired, and put greater effort to the development of superior naval weapons, employing, amongst other people, Robert Fulton who was in Paris since 1797 anyway. Various new ship types were secretly developed, though neither the ironclads nor the submarines that Fulton had designed at first were very practical. But Talleyrand saw potential in this research, and besides, he reasoned, they needed to do something, and hadn't a chance to beat Britain in a conventional naval race by simply building new ships. Instead, they needed a few better ships... just in case.
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These wars, however, were far from the only things happening in the world during that decade.
For one thing, the Age of Nationalism was beginning. At this stage, possibly due to cultural and social differences, its ideas did not catch on in neither Great Britain nor Germany; in Ireland, Spain and Italy, not to mention France where it all begun, nationalist ideas - especially in combination with neo-Jacobinism - slowly but surely gained esteem. Curiously, a form of nationalism arose in an English-speaking country as well - not in the UK, but the US. Fostered by president Alexander Hamilton and the succesful war with Spain, an united American national identity began to emerge.
That, however, was a steady long-term process. More short-term were Hamilton's various reforms. Though the Federalists had been in control since independence, Alexander Hamilton, one of the authors of the Federalist Papers, was clearly the most convinced, fanatical proponent of Federalism. He seeked to reform America along the lines of said Papers; needless to say, he had only limited success, but he did manage to reinforce the presidential power and generally the power of the central government, and create a new, modern, mass Federal Army that only saw action at the very end of the Spanish-American War, but showed itself quite well. Generally, as said, his efforts towards strenghthening the government and bringing the country together were a very limited success, but a success nonetheless. Several mostly succesful wars were fought with a variety of Amerind tribes. All-in-all, USA was on the ascendant, especially New England.
The United Kingdom of Great Britain and Ireland (as it was now officially styled) underwent much social strife. The conditions of life in the navy were reformed after the mutinies, and so the fleet remained mostly loyal, but in the very early 19th century a variety of Jacobinist, Irish and Luddite rebellions, which prompted reprisals, which prompted more rebellions. Fortunately Britain didn't need to deploy too many forces abroad at the time, and had plenty enough left to subdue everyone. But this was clearly wasteful, and eventually, in 1808, over George III's protests, some minor political reforms took place, some grievances taken care of, and, most importantly, Catholic Emancipation Act went into place. Sometimes, the survival of a nation matters more than even the ramblings of a mad king, who promptly died anyway, overstressed, completely insane and possibly a bit poisoned. The Prince-Regent took power as George IV and grudgingly approved the reforms, lest Britain not survive its next clash with the French. Aside from this and the various diplomatical intrigues against the French, Britain concentrated on colonial affairs. Though temporarily thwarted in Buenos Aires, the British consolidated their hold on the Cape Colony and defeated a Boer rebellion and a Khoisan invasion. Trade ties with West African peoples were furthered. In India, the British were very active. Sir Arthur Wellesley crushed the Marathas completely in the Second Anglo-Maratha War, defeating even Jaswant Rao Holkar; Central India came under British control, and the Marathas reduced to a puppet state. The governor-general, his brother Richard Colley Wellesley, was almost recalled, but Pitt the Younger persuaded the alarmed board of directors of the East Indies Company (whose funds the Welleslies wasted on their extensive military campaigns) that it is crucial to establish total control over the Indian inland, lest the local princes side up with France in the next war. So the warmongering continued, with the Fourth Mysore War in 1807 just after the long-awaited death of Tippu Sultan (Mysore was turned into an utter British puppet state). First colony on Tasmania was established as well.
France underwent much instability, especially after Pichegru's assassination by neo-Jacobins in 1803 and the ensuing purges. Louis XVIII attempted to claim absolute power, with Cadoudal's help, but was defeated by a triumvirate Lafayette (who had been returned to France after the Treaty of Versailles), Talleyrand and Augereau, who had united, respectively, the liberal segments of the aristocracy, the liberal/moderate middle class and the military. In the "Second Revolution", Louis XVIII, Cadoudal and their retainers were forced to flee for London from where they plotted their return after losing the battle just outside of Paris, and Talleyrand promptly engineered the ascension of the Duc d'Orleans, Louis-Philippe, who agreed to conform with the liberal constitution and was, after initial confusion, recognized by the Prussians and the Spaniards. Eventually, all the European governments but the British one recognized the new, Orleanist branch of the Bourbons, and even the British de facto recognized the new government of Prime Minister Talleyrand, who still retained control over the foreign politics it must be mentioned. He had thwarted threats from the far left (Fouche's conspiracy) and the far right (the Second Vendee War), and managed to restore law and order in France pretty quickly with the help of his collaborators. Abroad, France subdued Toussaint-Louverture's slave rebellion on Haiti back in 1801, though Dessalines continued a war in the countryside until his betrayal, capture and execution six years later. Under Talleyrand in particular, France intensified its colonial programmes; as propagandized by Talleyrand since his return to France, the French turned away from the Americas and India, and concentrated on building an African empire instead. First and foremost, France ceased paying tributes to the Barbary states; when their pirates begun attacking French shipping, punitive expeditions brought Algeria and Tunisia in line, as their key coastal cities were occupied with ease. Tripolitania was also reined in, but the French didn't bother conquering it and simply bombarded the harbour and destroyed the Tripolitanian fleet. Then the French left, and by a strange coincidence precisely after that the shaken Tripolitanians were overwhelmed by the Ottomans, who now annexed this land directly, in an effort to compensate for their losses in the Balkans. As for Algeria and Tunisia, both were ultimately conquered by the French, despite the heavy resistance encountered. Likewise, the Senegal colony was improved and expanded. French influence on Madagascar was strenghthened, though the Merina king Radama I was clearly in contact with the British.
Back in Europe, after the Spanish-American War and Fernando VII's extremist reprisals, a genuine neo-Jacobin nationalist rebelllion commenced in Spain (but interestingly enough only in Spain; the dissent in the colonies was rising, but not to such an extent). Fortunately, some forces still remained loyal to Fernando, and he managed to hold out in Madrid long enough for the French forces to arrive. Despite being fairly liberal at home, in Spain the French simply defended the reactionary absolute monarchy and dispersed everyone who resisted. The resistance wasn't well-organized, and gradually it dissipated despite the British attempts to fuel it up into a full-scale rebellions, although Fernando's power still did rest mostly on the French bayonets. Spain became a French satellite, practically.
Portugal sat by quietly while all this went on and expanded its African empire.
Germany and Italy alike saw much intrigue and disagreements. In Germany, though most states remained aligned with the Basel Pact, some, such as Munster have defected to the side of Austria. In Italy, in the aftermath of some neo-Jacobin rebellions, the Austrians occupied most of the states there, apart from Sardinia-Piedmont, where the rebels were defeated by France and where the local government had no choice but to align itself with France, even though the others allied with Austria instead.
Aside from that change, neither Prussia nor Austria changed much, though the Prussians put more and more efforts towards uniting northern Germany and both sides underwent military and buercratic reshuffling and reorganization, as larger armies were raised.
Sweden and the Ottoman Empire also struggled desperately to modernize their army along the modern line, especially the latter one. Janissary rebellions in 1804 were rather hindering, as did the constant need to fight back Wahabbi raids, but generally, progress was achieved by both countries, not without the help of French advisors - unable to turn Russia into an ally, Talleyrand begun propping up its enemies. The Ottomans succesfuly put down all the rebellions against him in the end of the decade anyway, apart from the Wahabbi one.
Despite several conspiracies against Tsar Pavel I, he simply went on ruling Russia, patronizing hospitallers and freemasons, forcefully reforming the Russian aristocracy, rooting out corruption, starting ambitious and ambigous social reforms (mostly the emancipation of serfdom), dispatching explorers everywhere, sending the conspirators to the various distant Siberian mines, organizing the colonization of Alaska and nearby territories, creating a Mediterranean fleet (based on Malta - the Knights Hospitaller had good bilateral relations with the Tsar, as for the British, they were somewhat annoyed, but didn't want to risk antagonizing Russia, so they tolerated it) and, ofcourse, expanding in Caucasia and Central Asia, having subdued the Cerkassians and the Kazakhs. All this really caused a growth of social strife and badly strained the Russian economy, but at the same time brought much prestige to Pavel's court. As the conspiracies against him formed one by one, Pavel grew more and more paranoid, and granted increasing power to kanzler Aleksey Andreevich Arakcheyev, who had created what was later called one of the first modern police states and in this manner saw to it that Pavel's reforms were carried out not only on paper, while the corrupt and/or disloyal officials were increasingly often simply executed.
Yet all in all, Russia was in its prime, and it was gaining ground in Central Asia.
Qajar Persia was recovering from its past civil wars, with the help of British subsidies; in exchange for these, it officially abandoned all claims on Russian Georgia and agreed to raid the Ottomans in Iraq instead, mostly unsuccesfully.
In Qing China, the Jiaqing Emperor struggled with corruption and crushed the White Lotus rebellion. However resplendant and arrogant the Qing Chinese Empire might yet have been, its problems that will plague it for the rest of the century were already obvious - lack of support amongst the people, chronic, indestructible corruption, increasing backwardness and economical crisis (the treasury, as of 1810, was kept partially filled only by bleeding the population dry with taxes). Japan's bakuhan system was barely being reinforced as poverty and dissent grinded away at it from within, and Russian and British attempts (all unsuccesful) to open up Japan - from without. Lastly, in Indochina, Bodawpaya of Myanmar, Rama I of Siam and Gia Long of Vietnam all reformed and strenghthened their realms, especially Rama I who codified religious and secular laws alike, reformed the buerocracy, built up a mighty army, subdued discontent tribes (though that was done by everybody, ofcourse) and lavishly patronized culture. Bodawpaya created a curious Buddhist theocratic monarchy, while Gia Long crushed rebels and opened up the country, most notably to the French missionaries. To the south from there, the Dutch and the British consolidated their colonial empires, but the Indochinese were oblivious to all this, oblivious to the fact that a new wave of colonialism was beginning, spurred onwards by Talleyrand and Wellesley, and socioeconomic factors too numerous and dull to mention.
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As all this went on, back in Europe the alliance system took on a more-or-less definite shape. Talleyrand's great diplomatic victories of 1798 were not completely reversed, but countered they were as the Austro-Russian and Anglo-American alliances grew closer together. The Americans had further ambitions towards Spain, despite all their treaties, and a large, ever more influential faction supported the complete dismantlement of the Spanish colonial empire; this was not too unpopular in Britain neither, as Britain would have automatically gained great influence over an independent Plaitne state. But the British were clearly more concerned by France, and the threat to Britain's safety that it clearly constitued especially now that it begun to stabilize after a tumultous decade. The Austrians didn't care too much about Spain, but their dreams of German hegemony were challenged by Bavaria (which now joined the Basel Pact) and Prussia, while the dream of Italian hegemony was challenged by France. Finally, Russia was rightly suspicious of French assistance to Sweden and Turkey (both of them de facto members of the Basel Pact by now as well), and strongly disliked Prussia. The two alliance systems would not clash for over a decade; but already now, the preparations for that eventual clash begun...