The American Volunteer Group under Claire Chennault was being actively recruited and prepared for combat in support of the Chinese in 1940. The Flying Tigers were in place when Pearl Harbor was attacked although they did not see combat until 20 December 1941. A loan had been made to China by the US of 25 million dollars and the embargo of oil and aviation gas was directly tied to US support for China.
China
December 7, 1941 - when the Japanese bombed Pearl Harbor.
Before December 7, 1941, America tried to avoid involvement in the World War. Japan continually tried to provok America to fight, but we had resisted their many attempts.
Japanese attacked Pearl Harbor in December 7 1941. They regretted it.
China during the 1930's, the rest of the conquests occurred in 1941 & 1942.
Fighting China (1894), then fighting Russia (1904), then invading China (1931), well before Pearl Harbor (1941).
Before Germany invaded Poland in 1939, before Japan bombed Pearl harbor in 1941, Japan was fighting in China.
China
The United States became involved in the World War II about March 1941.
The US was involved for 6 years from 1941-1945
December 7, 1941
December 7, 1941 - when the Japanese bombed Pearl Harbor.
December 7, 1941 Pearl Harbor
Officially from December 8, 1941 to the finish.
The United States got involved in World War 2 after the bombing at Pearl Harbor on Sunday, December 7, 1941.
What years a WW2 veteran served depends on what country he fought for. The war started in China in 1933, in Europe in 1938, and involved the United Sates in 1941. It ended in 1945.
6 years errrrrrrrrr from 1941-1945