how did the united states go from neutrality in the 1930s to war in 1941
Neutrality Acts of 1930s After repeated attacks by German submarines on U.S. ships, Roosevelt announced on September 11, 1941, that he had ordered the U.S. Navy to attack German and Italian war vessels in the "waters which we deem necessary for our defense". Following the sinking of the U.S. destroyer Reuben James on October 31, many of the provisions of the Neutrality Acts were repealed on November 17, 1941: merchant vessels were allowed to be armed and to carry any cargoes to belligerent nations. The U.S. formally declared war on Japan on 8 December 1941 following the attack on Pearl Harbor of the previous day; Germany and Italy declared war on the U.S. on 11 December 1941, and the U.S. responded with a declaration of war on the same day.
Allies of World War I The U.S. declaration of war on Germany, on 6 April 1917 was on the grounds that Germany had violated its neutrality by attacking international shipping and the Zimmermann Telegram sent to Mexico.[4] It declared war on Austria-Hungary in December 1917.[5][6] The U.S. entered the war as an "associated power", rather than as a formal ally of France and the United Kingdom, in order to avoid "foreign entanglements".[7] Although the Ottoman Empire and Bulgaria severed relations with the United States, neither declared war.[8]