Following what event did the European powers meet in Vienna and first establish the idea of a balance of powers?

answer: what was the us involvement in ww1? although the u.s. tried to remain neutral when ww1 broke out, it finally joined on april 6, 1917 after declaring war on germany. the reason for america to become involved in ww1 was germany's unrestricted submarine warfare, which had already sunk several american merchant ships.

explanation:

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the answer is c. hope this

the answer is c have a good day