Twice in this century, Germany opted for war with the United States on the basis of what its leaders perceived to have been "calculated risks" designed to overcome a strategic impasse on the Continent. Twice the gambles failed. The first miscalculation ended in defeat and revolution; the second in near annihilation.
Herwig, Holger H.
"Miscalculated Risks: The German Declaration of War against the United States, 1917 and 1941,"
Naval War College Review: Vol. 39
, Article 9.
Available at: http://digital-commons.usnwc.edu/nwc-review/vol39/iss4/9