I´ll not reply to the first part, since that would derail the thread.Germany didn't start World War One any more than Russia did by saying they'd support Serbia in a war. Hell, if we're going to unreasonably assign blame for a cascade of foreign policy fuck ups all around Europe, the blame lies squarely on the Russians and A-H. A-H for pushing for such unreasonable demands and Russia for mobilizing, forcing a German and A-H response in kind.
As to the thread topic, is this government interested in Pan-Germanism (sans Austria), and how many ethnic Germans are outside its borders? That could cause quite a bit of tension with its neighbors.
Pan-Germanism was, again, dependent on who would come out of 1848 how and why. It was present in the revolutionary movement ("Von der Maas bis an die Memel, von der Etsch bis an den Belt" was von Fallersleben`s wording in the poem which would become the national anthem). The relatively smooth decision pro Kleindeutsche Lösung showed that it wasn`t insurmountably strong, though. Also, German nationalists often fought alongside universalists / internationlists, at least the questions of relations to France, to the Hungarian and Polish 1848 movements etc. were hotly debated controversial issues.
And, looking closely at Fallersleben`s lines again, what is obvious is that there was no idea whatsoever to gather ALL of the German diaspora in one state, since it clearly does not include Transilvania or the Volga... The emerging idea of the German nation and its boundaries owed a lot to the pragmatics of the princely Deutscher Bund, plus disputed cases (Schleswig-Holstein) in favour of inclusion.