Here's my Brandenburg empire so far, no German unification yet . I've also taken over quite a bit of North and South America, mostly through colonisation and annexing the Native American tribes after winning wars with them.
I've gained most of my European provinces through conquest although I did annex Saxony which had about 7 provinces at the time. I'm currently allied to Castile and just got out of a successful war with Austria and Bavaria (they are allied to each other), I have a claim on Wien (Austria's capital) so I took advantage of this and declared war on Austria when they were losing a war against the Ottomans. I gained 2 out of 3 of Bavaria's provinces and about 6 or 7 of Austria's.
At the moment I have my armies lined up along the German coast to be shipped over to South America to conquer the Incas, I've already had one war with them but unfortunately I didn't have enough armies to annex them, so I claimed about 5 of their provinces instead, but I hope to annex them this time around. After that I will not need a large military presence in the Americas any more for a while, so I will ship them back to Germany and probably declare war on Poland with which I have a casus belli with, the only problem with this is that they are currently allied to Burgundy, so I will most likely have to fight a two front war.