His basic foreign policy following this period of expansion was rather conservative and avoided war - that eventually got him fired in 1890 by the young and very aggressive Wilhelm II, whose own policies came to a thundering head in August 1914. That one didn't end well for Germany.
Not to mention the fact that the Hapsburgs had set themselves up after the Napoleonic Wars to block German unification by Austrian manipulation of the German Confederation post-1815, which was a significant obstacle. We tend to forget the Austro-Hungarian Empire had its own agendas, even in its dotage.....