yes it was vital 4 the US 2 enter World War 2 because we needed their help 2 win the war. It turns out tht because of them we won the war.
Not really,they entered because the Germans thought that they attacked them.So it wasn't that vital,they wouldn't even enter if the Germans didn't attack Canada.
depends on who us is
The U.S. Entered World War 1 in 1917.
the us decided to enter world war because they want the resources of france, and they want to keep on ruling france.
They didn't enter the first world war
russia dropped out the war
Germany declared war on the US. The US entered World War 2 because of the Pearl Harbor raid.
The us entered ww2 in 1941