By 1860, the slavery issue had come to a head. The slavery issue split the Democratic party into Northern and Southern factions, and each ran separate candidates. The Republican candidate, Abraham Lincoln won.
I think it's:
The Revolution of 1848 failed in its attempt to unify the German-speaking states because the Frankfurt Assembly reflected the many different interests of the German ruling classes. Its members were unable to form coalitions and push for specific goals. The first conflict arose over the goals of the assembly.
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The Germans defeated Russia during the World War I. The reason for its loss was that the Czar of Russia embarked on war that the country was not prepared for. He took control of the army and his strategies were a failure which left him with all the humiliating defeat and blame of its people.
it would be B i just took the test....and i have proof