What factors conspired to propel the United States to emerge as a military and economic powerhouse prior to World War I?

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the pogroms became known as kristallnacht, the "night of shattered glass," for the shattered glass from the store windows that littered the streets. the morning after the pogroms 30,000 german jewish men were arrested for the "crime" of being jewish and sent to concentration camps, where hundreds of them perished.

b. ensure mutual protection from communism.

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that would be the steamboat because none of the other things are forms of transportation