Military history of the United States during World War II

The military history of the United States in World War II covers the war against Germany, Italy, Japan and starting with the 7 December 1941 attack on Pearl Harbor. During the first two years of World War II, the United States had maintained formal neutrality as made officially in the Quarantine Speech delivered by U.S. President Franklin D. Roosevelt in 1937, while supplying Britain, the Soviet Union, and China with war material through the Lend-Lease Act which was signed into law on 11 March 1941, as well as deploying the U.S. military to replace the British invasion forces in Iceland. In the Pacific Theater, there was unofficial early U.S. combat activity such as the Flying Tigers. The U.S. economic sanctions on Japan, as part of the effort to deter Japanese military aggression in Asia and the Pacific, was a major cause of the Japanese attack on Pearl Harbor.

Question: was the united states in world war 2
Answer: yes