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.
I'm not 100% sure this is the answer but I know they were successful in math.
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It was Confucius who wanted to bring good government
Communal living would be a society where everyone lived in the same community and shared everything. So the answer is A.