They could not keep up economically. In other words Germany ran out of money.
Srry i'm soo late but the answer is A. President McKinley's desire for war.
Hope i Helped :)
The external borders of the Empire did not change noticeably from the Peace of Westphalia – which acknowledged the exclusion of Switzerland and the Northern Netherlands, and the French protectorate over Alsace – to the dissolution of the Empire
