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.
Wiki User
∙ 2015-08-18 13:45:49Wiki User
∙ 2009-03-30 18:55:06December 8, 1941 is when the U.S.A. went into the war. Japan declared war on the U.S.A. on December 7, 1941.
Wiki User
∙ 2010-12-02 14:37:02The us entered ww2 in 1941
depends on who us is
The US entered World War 1 on April 6, 1917. The war ended about one and a half years later.
The U.S. Entered World War 1 in 1917.
Into Europe
1918
1917
1941
1914
1917
on decmber 8 1941
1917
1909 to 1944 The US entered World War 2 in December of 1941.
The US did enter World War 1, though not till 1917.
The United States declaration of war is from 6 April 1917.
depends on who us is
1917
1990