PLS HELP ME QUICKKK In 1949, the United States entered a military alliance known as
A. NATO.
B. the Warsaw Pact.
C. the United Nations.
D. Security Council.

C the United nations and hey

yes.

explanation:

because it let the japanese know who had the upper hand in the war.

united states reinforcements contributed greatly to three allied victories in france at: cantigny (first major american battle), argonne (the largest in the united states military history, involving 1.2 million american soldiers), and château-thierry (one of the first actions under general pershing).