what effect did us entry into the war have?
it prolonged the war even further.
it increased the amount of fighting.
it bring an end to the war.
it built support for the triple alliance.

"it helped bring the war on the Western front in Europe to an end"

Explanation:

im guessing were talking about world war one.

got the answer from enotes.com so it may be right

the main inference that can be drawn from jean jacques rousseau's book the social contract is: a. people can enjoy civil and physical freedom, even if it sometimes harms society.

d.prevent the spread of communism outside of eastern europe.