Less than 4 years.
3 years =)
the US joined the war in 1917 and the war ended in 1918. Answer: 1 year.
2 years
The US was in the World War 2 from December 7/8th 1941 to August of 1945. They had to stay in Europe and Japan for many years after the war too.
World War 2 began September of 1939 and ended August of 1945. The US declared war on Japan on December 8th 1941. So the US was in the war nearly 4 years.
The US decided to remain neutral in this war, however this pact did not last long.
8
Persucution of the jews
6 years errrrrrrrrr from 1941-1945
one hour
one year
About 3 weeks.