And here, as promised, a new map.
Time period is pretty much ignored, I more or less skewed historical lines and made several things occur simultaneously.
Black is Großdeutschland, of course. In dark gray is Großpoland. Or Poland-Lithuania to be more precise. The Commonwealth and the Holy Roman Empire(since the Germany thing pretty much is a centralised HRE), have broken historical trends and declared themselves allies. This is most apparent in the marriage of the heirs of both empires to eachother. The grandchild of the current rulers of Poland-Lithuania and Germany, once they are born/come of age, will rule over all three kingdoms. Take that, Charles V.
In dark red, are vassal states of the "European Confederation", as it's sometimes called. First, the Hohenzollerns managed to defeat the Habsburgs, as historically, and have seized Silesia and most of Austria-proper. Most of the remaining Habsburg possessions have been re-branded the Kingdom of Hungary, centered on said area.
With that done, the alliance became extremely ambitious: they targeted the Ottoman Empire. Rallying the Venetian navy(and it's expertise in fighting the Ottoman dogs) to it's side, the alliance marched into the empire, eventually taking Istanbul. The Ottoman navy and much of it's army was destroyed, while the end result was Venice swallowing up nearly all Eastern Mediterranean islands and Greece proper, not to mention the whole Eastern Adriatic coast. The Commonwealth-German alliance grew in power by freeing most Balkan states, but making them so small that they couldn't rise up to defeat their northern overlords.
With Germany using Pan-Germanism and Poland-Lithuania using Pan-Slavism to further their claims, they grew in power. They moved against Russia as well, fulfilling Poland-Lithuania's request that the growing Muscovites be pushed back. The end result was the splintering of Russia into several states(with Moscow still large, but greatly reduced in power), most of which were vassalized to the alliance. Novgorod was reborn, serving as an ally of the great empire. When Germany invaded Denmark to further it's Pan-German schemes, Sweden joined in, taking most of Norway. They too, became allies with the Empire, nullifying chance of war with the north.
France naturally was a question. They were greatly PO'ed when the Germans annexed Alsace-Lorraine, which they had wanted just as badly. The savvy diplomats of the Commonwealth-HRE moved faster than French militarists, however, and managed to get France on the Emperor's good side. They hatched a plot to invade the Spanish Netherlands, and an enormous war ensued. Portugal and England joined in on Spain's side, wanting to preserve the balance of power, and more players gradually entered to make a continental war. But the Germans and Poles - with their French allies - managed to pull through. They captured Madrid and made the Spanish King abdicate, installing the French ruler on the throne instead, to rule the Kingdoms in personal union. Portugal fell easily afterwards, but it was left alone for the most part. England was convinced to stop the bloodshed.
With this massive conflict over, France now ruled Spain, while Spain also had to release Galicia so as to mitigate the French gains. Portugal and Britain were left out of the equation, though they both pledged to remain less-active in European affairs provided no wars between great powers occurred. The Venetians, having remained loyal to the Imperial forces despite the fact all Italy went against them, was given the chance to become the Kingdom of Italy. Claiming the title "Republic" instead, Venice became Italy, occupying much of the north, while sharing the southern parts with Spain in a condominium.
Hegemony by the Commonwealth and it's Imperial brethren ensued, naturally, narrowly kept in check by the Western powers' mutual distrust.
Those light green states in North Africa are the autonomous states of the Ottoman Empire; the Ottomans had to grant more and more autonomy to local rulers with the destruction of their navy(read: the link to the far-flung territories) and the humiliation that Ottoman "invincibility" suffered.