2007-03-17 05:21:51 · 7 answers · asked by Scarlet Hippo 16 3 in Arts & Humanities ➔ History
1941 officially but before that the U.S. was providing weapons to the British, the Russians, and Chinese. In some cases "volunteers" fought under the flags of the British Empire and the Republic of China.
However the Europe was already at war in 1939 and Asia since 1937.....which was the beginning of the Second Sino-Japanese war which eventually became part of WWII.
2007-03-17 05:24:24 · answer #1 · answered by ami.kawabata 3 · 2⤊ 2⤋
FDR declared war on Japan on Dec. 8th 1941 the day after the Pearl Harbor attacks. However, the USA were waging a secret war for over a year against the Germans. So we were involved just not officially. Hitler declared war on USA 2 days later.
2007-03-17 05:36:36 · answer #2 · answered by Anonymous · 1⤊ 0⤋
WW2 started on September 1, 1939 and the US declared war on the Japanese empire on December 8, 1941. Germany declared on US on December 11,1941
2007-03-17 08:35:22 · answer #3 · answered by Dave aka Spider Monkey 7 · 1⤊ 0⤋
1941.
2007-03-17 05:29:13 · answer #4 · answered by Anonymous · 0⤊ 0⤋
congress declared war in December1941 against japan,Germany and Italy.
2007-03-17 06:10:13 · answer #5 · answered by endgame1915 3 · 0⤊ 0⤋
12/7/1941 ever hear of Pearl harbor??
2007-03-17 05:24:58 · answer #6 · answered by Jim7368 3 · 1⤊ 0⤋
2 years too late
2007-03-17 05:26:04 · answer #7 · answered by greenname16 2 · 1⤊ 0⤋