Assuming you're referring to World War I, the main event that moved the United States from neutrality to war was the sinking of the Lusitania, since many Americans died, and it was the Germans who were responsible.
B i would assume as it was the us army that helped significantly with the d day invasion as the us military were advanced in training
False. Supreme Court said that a group can be supported, EVEN if it's religious.
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i'm not well rehearsed in the boxer rebellion but im pretty sure it showed to the european powers that china was to big to be simply colonized and if they do decide to colonize china it would fall pretty fast im not entirely sure but this is what i think :)
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