December 7, 1941
Actually, it was largely because of the attack on Pearl Harbor. The US was already involved in the war financially, but they first deployed troops after that attack.
because they attacked Pearl Harbor
It was The US entered WW I on April 16th, 1917.
The US reaction was to counter attack. Commencing at Guadalcanal in 1942.
they now had to enter the 2nd ww on Dec.7 1941
At the beginning of WW II the US hoped not to get involved. It was only after the US was bombed by Japan, at Pearl Harbor, that the US found that it could not avoid gettting involved.
With reference to December 7,1941, the results of the attack on Pearl Harbor was that the US entered WW 2. The US had to declare war on Japan. There was no decision on that. What was new was that Hitler then declared war on the US. The results of the first attack brought the US into a two front war.
Only Pearl Harbor. No other US city was attacked by Japan.
Oskar Schindler was not shot; he died of natural causes on October 9, 1974, in Hildesheim, Germany. Schindler was known for saving the lives of over 1,200 Jews during the Holocaust by employing them in his factories.
20th century: 2nd Balkanic war, WW I, WW II
The US became involved in World War II after the Japanese attack on Pearl Harbor on December 7, 1941. The attack led to the US declaring war on Japan, and subsequently, Germany declared war on the US. The president at the time was Franklin D. Roosevelt.
This question may pertain to WW 1, WW 2 or the Cold War. Using the latter as a reference, the US and over 20 other European nations, Canada and the US are allied with the treaty plan called NATO. An attack against one NATO member is considered an attack on all NATO members.