The US entered The Second Great War on December 7, 1941.

After the unexpected assault on Pearl Harbor by Japan. This assault prompted critical misfortunes and excited general assessment for joining the contention. On December 8, 1941, Congress proclaimed the battle on Japan, denoting the U.S. official section into the conflict. Only a couple of days after the fact, on December 11, Germany and Italy proclaimed a battle on the U.S., further raising the contention. This was undeniably a defining moment, as the U.S. prepared its assets for a huge worldwide military exertion.