OOC: Near the end I wrote in not much detail, but rather only passing on the general idea - I DON'T want this post too to be split into two parts, and frankly I didn't feel as if many details were needed. Next part will deal with early 18th century, leading up and including the Second Rhenish War, with immediate consequences. After that, a detailed post about political turmoil in several European countries, followed up by another post on a very big, very decisive war.
IC:
1649-1700. Europe.
Before we move to the military and diplomatic matters, it is important to see the internal and cultural developments within significant countries.
Scotland, a radical republic, still was the archenemy of the absolutist England. Now it was not just a battle of nationalities and dynasties, but rather of religions and ideologies. England underwent something of a counter-reformation - albeit the Anglican church remained strong, Catholics were increasingly influential during the reign of Charles II (himself a badly-hidden, and not at all hidden in his last years in fact, Catholic), and this, along with financial troubles caused by the Anglo-Dutch Wars, resulted in numerous rebellions that were put down with much bloodshed. Perhaps reforms would have been more profitable, but Charles II remembered the troubles that came the last time Parliament was granted some powers. So, "no thanks." Scottish radicalism eventually resulted in a purge of aristocracy in 1652, albeit those aristocrats who no longer claimed to be such were left alive, rich and powerful, so not much harm done. Scotland was feared by the monarchs of Europe (not Scotland itself, but rather the example it set), at least until the more moderate faction triumphed in 1662... just in time to ally with Sweden. Oh, and Ireland rebelled against England and Scotland alike.
In France, the power of the nobility slowly declined, whilst that of the intendants rose. Still, the Parlement remained influential, rather more then that of England. And needless to say, France remained the cultural center of Europe, as the Enlightenment took its roots. French army was also undeniably the best of its time, albeit its navy, though large, often suffered badly in wars with Holland. The revocation of the Edict of Nantes in 1667 caused some religious strife (OOC: note that for the lack of a Fronde, Louis XIV doesn't hate Paris, nobles or the people all that much, so the Parlement is more powerful then in OTL, nobles aren't completely removed from power yet and Versailles isn't built).
To the south was Habsburg Spain. After the Eight Years War the only Habsburg power in existance, Spain somehow struggled along, and actually the rule of Philip V saw a minor resurgence - numerous reforms were undertaken, many colonial grievances were reviewed, generally Spain seemed as if it stood a chance at becoming a power once more. But the First Rhenish War exposed its numerous weaknesses once more, and the Habsburg rule only barely survived. To its west, Braganca Portugal wasn't much better, still a declining power - the Spanish rule was used by the Dutch to grab many Portuguese colonies, and that did not stop under the Bragancas.
Holland underwent a political and a religious crisis, with the conflict between House Oranje and the States Generale and occasional Catholic rebellions. Albeit Holland was a mercantile republic in name, it was by the end of the century more of a parliamentary monarchy - the stadholder's powers were rather limited by the States Generale, but not enough for him to become insignificant. Also, House Oranje actually formed dynastic ties with Nassau, eventually using instability in Germany to, with Sweden's blessing, annex some troublesome northwestern regions (most significantly a half of Munster and Cologne, with an enclave in Nassau) as "associated territories". Still, the focus remained on Holland and on mercantilism.
Gustavus Adolphus III (his famous father died in 1661) and his Sweden was one of the most powerful European nations, but it constantly was in conflict with France, with Poland and with its German "allies" - the latter eventually turned into little more then... client states. Gustavus himself was the adherent of the idea of "mixed rule" within Sweden, basically dividing the power between himself and the Riksdag... de jure. Albeit this did help solve numerous problems, de facto the king was ofcourse predominant because he was able to dismiss the Riksdag. Similar was the political situation in Denmark, which in spite of all managed to prosper economically when compared with Sweden, which had to expend greatly to put down rebellions, especially in Germany, and to fight the French.
German Confederation and Corpus Evangelicorum with time evolved to be one and the same, whilst the "ceremonial" head of it all gradually became the same person as the "Duke of Pommerania". The Duke of Pommerania being also the King of Sweden. As said before, the wars with France and Poland and the rebellions forced Sweden to increase its ties with the German states, and albeit the final step - that of uniting the two - would not be taken until well into 18th century after Europe was shaken by certain immense political and military events. Within the Confederation, kingdoms of Brandenburg and Bohemia were the strongest, whilst Austria and Saxony were definitely in decline. But even those two kingdoms didn't dare move against Sweden.
Italy was, for the most part, aligned with France, apart from the neutral, declining Venice and Genoa. The Pope was also moving between neutral and pro-French, but it were Savoy, Milan and Naples, the three most significant Italian countries, that were on French side. All smaller states thus had no choice, at best they could maintain a pro-French neutrality.
Poland was undergoing a brief resurgence, rather undone by the ravages of the First Rhenish War. Jan III Sobieski was crucial to both the rise and the fall, being an energetic and popular ruler, and managing to manipulate the divided Sejm. Absolute monarchy never was restored to Poland, but in this time it was as strong as ever during the Royal Republic.
Ottoman Empire was in its zenith. Hungary was subdued, and albeit rare rebellions and haiduk risings threatened the Ottomans there and in Romania, the Ottomans managed to consolidate their gains and to entrench in them. The Koprulu Viziers undertook capable reforms that made the administration of the Ottoman Empire more possible, and wisely stayed out of major European wars for the most part, apart from a minor border war with Poland using the First Rhenish War. The wars with Russia were largely inconclusive, with the fortress of Azov changing hands several times. The Turkish power during this period was rather concentrated on expanding in Africa (conquest of Morocco) and wars with Persia, eventually resulting in the conquest of Aizerbadjan (OOC: meaning the Greater Aizerbadjan, including a large northwestern part of Persia) and Abadan, as well as confirmation of Turkish sovereignity over Transcaucasia. But already, Ottoman Empire was beginning to suffer from weakening commerce and overstretchment... This will result in great damage to Turkey, but much later.
And on the fringes of Europe, there was Russia. Here, Absolutism was unchallenged, and indeed Russia was hardly "European". It did modernize and adopt many European ideas, but Westerner influence in culture was restricted (i.e. Modernization without Westernization - think Meiji Japan). Powerful tsars kept their alliance with Sweden, instead concentrating on wars with Poland and Turkey, and China in the Far East, but tensions steadily increased between the Swedes and the Russians. Also, there was religious and political strife (not nearly as much as in OTL, though - remember, Patriarchate and Tsardom are united, not too unsimilarily from OTL England's arrangement with the king being the head of church). Reformists threatened Church integrity when Tsar-Patriarch Fyodor IV bitterly resisted calls to revise the church books (written in Church Slavic, literally translated from Greek and thus, combined with occasional scribe mistakes, "imperfect"), whislt cossacks and peasants occasionally rebelled to resist further enserfment (different people in charge - no Morozov - enserfment still increases, but not as much as in OTL, de jure at least). But all rebels were put down, if only because of their internal disagreements.
So, the pieces are in place, the game begins anew. In late 17th century, there were two more major European wars - the Eight Years War and the First Rhenish War. Albeit alliances were not completely static, the general idea remained the same - France, Portugal, England, Denmark-Norway, Savoy, Milan, Two Sicilies and Poland were opposing Sweden, Holland, Scotland, most German states, Spain and Russia. In the Eight Years War, however, the French also found an... unlikely ally - Habsburg Austria.
Eight Years War started in 1666, but its hard to say whether it started on May 9th, when Admiral Gerard's English fleet refused to salute before the Dutch fleet, and instead started a battle where the English lost three ships while the Dutch, losing only one ship, nonetheless retreated after it became clear that their luck has ran out, or if it instead started on June 1st, when the French government, claiming that Lorrainean "troops" (Lorraine hardly had something that can be called an army, albeit a small force was kept) commited incursions into French enclave around Metz, declared war on Lorraine. German Confederation and Sweden declared war on France, and the rest you can guess.
Anglo-French troops tried to invade Scotland, but faced surprisingly determined and capable resistance led by Douglas Inveraray, who defended Edinburgh succesfully for seven months until the Swedish reinforcements arrived. With Swedish help, Scotts, albeit losing Ulster to the Engish forces, suceeded in capturing Carslisle and Newcastle, though further advance was prevented by Warrington's Anglo-French troops at Humber in 1668. The war here degenerated into minor skirmishes afterwards, albeit in 1671 there was an attempted Swedish landing in Belfast. The eventual Treaty of Westphalia restored status quo here, albeit the English were obliged to limit presence of their troops in Ireland.
Spain fought with France mostly to avenge its defeat and to regain Catalonia. There was much irony in the situation - this time, France was posing to be the "protector of Catholics" and fought with Protestant Sweden, and Spain in spite of its religion was on the Swedish side, whilst in the Thirty Years War it was the other way around. Reformed Spanish armies did surprisingly well, defeating the French at Sabadell in Catalonia. But the expected pro-Spanish risings never came, the invasion of Portugal was defeated at Elvas, and eventually the French forces, triumphant in the Mediterranean, forced Spain out of the war with the 1672 capture of the Balearics and Valencia; Spain didn't lose territory aside from Sardinia, which was annexed into the Kingdom of Two Sicilies, but it also had to pay an indemnity.
Denmark-Norway was handed several decisive defeats very fast, albeit the Swedes failed in their assault on Copenhagen in 1667. Eventually, Denmark-Norway had to cede Skane and Bremen-Verden in 1671, unable to fight on under the great pressure, intensified by the Dutch commerce raiding.
But the three main theatres were in Germany, more or less. The Rhenish Theatre was also extending into Holland, whilst the Baltic Theatre extended into Swedish Livonia and Poland; Danubean Theatre was solely in Germany, however.
French forces quickly crushed Lorraine overcoming what little resistance there was, and succesfully conspired with the Trier and several other anti-Swedish princes, starting a rebellion in Germany. The rebellion failed to gain momentum in most of Germany, but in the west and the south (in the latter it was less of a princely and more of a popular Catholic rebellion) it scored several victories, helping the French. Conde's forces defeated the Bohemians at Cologne (Bohemian Wittelsbachs still did control Cologne and the Palatinate; after the war, they agreed to cede Cologne to the Dutch to deal with their overstretch) and before Sweden could respond properly outflanked the Dutch army, which already was hard-pressed by Anglo-French forces in Flanders, losing Ghent. Stadholder William III rallied the Dutch in a defense and opened the dikes, flooding the Dutch lowlands in order to stave off the French invaders. This worked, and the Dutch, reinforced by Sveldssen's Swedish troops, pushed the French back into Cologne. Brussels and Ghent, however, fell before they could be relieved, and by 1669 both armies settled in a stalemate in Flanders; thus the main war here took place in Rhine, where the Swedish forces reestablished control and threatened the flank of the French forces in Cologne. The French won the Battle at Koblenz, but their war effort eventually declined when Swedish-Bohemian forces succesfully, in 1671, captured Trier. The French still managed to regain the initiative in 1673, but as their plans for a maritime invasion of Holland were upset back in 1671 by Ruyter, they could only attack effectively in Trier and the Palatinate, making some headway and getting favorable peace in 1674 in Westphalia, where France was confirmed in its gain of Lorraine, Alsace and Trier, but withdrew from elsewhere, leaving Holland intact. The Swedes, however, were recognized in their domination of Germany, allowing them to further consolidate their power there - leaving garrisons in several major German cities and limiting the freedom of the foreign policy of the confederate states.
When in 1667 it became clear that the knockout victory against Holland was no longer feasable, the French decided to open another front, allying with Austria and sending troops through Italy to the Danubean Theatre. Combined with rebels in Bavaria, the Austro-French forces, commanded by Turenne (he died in the fighting and was replaced by Davout) and Hardenberg, achieved many initial successes, but their attempt to link up with the French forces on the Rhine was defeated in 1669 at Heilbronn. Further defeats followed, Bohemian-Swedish forces captured Vienna and a Protestant rebellion ousted Habsburgs. Eventually, the French in 1673 had to completely retreat out of Austria. After the war, Austria was never returned to the Habsburgs, instead going to the heretofore extremelly insignificant (well, more like since 14th century, but even then they held only a puny county) Zahringen Dynasty. With the loss of Lorraine, Trier and Alsace to France and the forceful reformation of Austria, there were no Catholic principalities left within the German Confederation.
The "Baltic Theatre", where the war with Poland was waged, immediately saw some Polish victories - albeit at sea, their small navy was grounded, on the land they took Konigsberg, Memel and Riga. An offensive into Pommerania was beaten back, though, and Danzig held out during the siege; still, the well-trained Polish armies, adjusted to the lessons of the previous war, managed to hold their ground against Sweden most of the times - not counting 1672, when the Swedes captured Cracow, but they were in the same year repulsed by rebellions and Polish troops. Thus, the Poles preserved the status quo here in spite of the fact that they were threatened from all directions at once.
Also, Poland fought this war with Russia, making much headway due to instability in the latter and the superior Polish training. The peace treaty would see Podolia returned to Poland, albeit Kiev and Smolensk remained Russian.
The main consequence of the war, apart from the strenghthening of Sweden's grasp on Germany and the continued rise of Holland as a naval power, was that the French and their allies, having gained much territory, still remained hungry for more. Thus 1683 brought the First Rhenish War, so-called because Louis XIV felt that the natural border of France should go along the Rhine and, evidently due to this provoked a Catholic revolt in Flanders and supported it. But this time, the Swedes were prepared, the Catholic rebellions in Germany failed, and the Anglo-French armade was annihilated at Dover in a daring attack. On the land, the French made some gains in Rhineland, but were stopped at Brussels by the Dutch-Swedish armies (who greatly fortified Belgium since the last war), whilst the Scottish armies held strong against the English, even attacking in Ireland. In Spain, though, the French did very well at first, very nearly in spite of all the modernization efforts taking Madrid and generally wrecking havoc - but eventually, they were stopped short of victory here. The Poles fared very badly as well - albeit they did well at first, eventually the Russian army, much improved since the last war, combined with the Swedish one to push the Poles out of Courland and Greater Lithuania, and in the west the Swedes pillaged the vital core areas of Poland on the Vistula. Venice, in Italy, eventually sided with the Swedes, being promised Mantua (and getting it eventually), and here too the French faced defeat. They fought on until 1687, but it became clear that Louis overestimated his kingdom's power - the Swedish armies were stronger then before, reinforced by well-disciplinned armies of Brandenburg and Bohemia, and won the great battle at Zell. France could have fought on for longer if not for the major revolts that filled the country and the bad financial situation, and eventually France agreed to a peace treaty, conceding Trier to a local dynasty and granting independance to Catalonia (under the Claris dynasty). Disillusioned and depressed, Louis died in 1692, to be succeeeded by... Louis. Only this one was Louis XV, who swore revenge and begun to greatly reform the French army and fleet, and who had Vauban construct numerous forts. Poland, meanwhile, signed peace, ceding Podolia and eastern parts of Greater Lithuania (OOC: meaning the eastern half of OTL Belarus, with Minsk a Polish border city) to Russia and Courland to Sweden... England ceded a northwestern chunk of Ireland to Scotland, whilst the Swedes, apart from getting confirmed in their predominance of Germany, also grabbed Holstein-Gottorp, Trondheim (they did try to take it in OTL) and all Norwegian lands further north and east.
Thus the 18th century begun with another war in preparation...