Why did the united states decide to respond to increasing totalitarian aggression in europe and asia?

Which statement about submarine use in world war i is true? the allies never found a way to counter german submarine warfare. germany’s use of submarines affected the united states’ decision to enter the war. only the germans used submarines in world war i.

Why did federalists fear the louisiana purchase? what did they think would happen?

During world war ii, which battle was the first significant us victory in the pacific?