What year did the us enter the world war 2?

Answer 1

The United States entered World War II after the Japanese attack on Pearl Harbour on 7th December 1941. The US declared war on the following day, 8th December 1941.

Answer 2

December 8, 1941 is when the U.S.A. went into the war. Japan declared war on the U.S.A. on December 7, 1941.

Answer 3

The us entered ww2 in 1941