<span>They had civil wars supported by foreign countries.</span>
This is literary the show of power. Bismarck, by ignoring both the parliament and the constitution of the nation, undermined their authority which led to the weakening of the institution. Bismarck was though adapt at manipulating not only the government but also the public opinion of the masses through corrupt journalists and newspapers.
Depends. What war are you talking about? If it's WW1, then it's because everyone was stupid at the time and thought their enemies did it and one thing led to another.
THAT WOULD BE JADE HAVE A GREAT NIGHT!