when did the us join world war 2 in europe
11 December 1941
title: Allies of World War II text: war on Japan, and Japan's allies Germany and Italy declared war on the US, bringing the US into World War II. On 8 December 1941, following the attack on Pearl Harbor, the United States Congress declared war on Japan at the request of President Franklin D. Roosevelt. This was followed by Germany and Italy declaring war on the United States on 11 December, bringing the country into the European theatre. The US-led Allied forces in the Pacific theatre against Japanese forces from 1941 to 1945. From 1943 to 1945, the US-led and coordinated the Western Allies' war effort in Europe title: Allies of World War II text: Africa. After the start of the German invasion of North Europe until the Balkan Campaign, the Netherlands, Belgium, Greece, and Yugoslavia joined the Allies. After first having cooperated with Germany in invading Poland whilst remaining neutral in the Allied-Axis conflict, the Soviet Union perforce joined the Allies in June 1941 after being invaded by Germany. The United States provided war materiel and money all along, and officially joined in December 1941 after the Japanese attack on Pearl Harbor. China had already been in a prolonged war with Japan since the Marco Polo Bridge Incident of 1937, but officially joined the title: World War II text: late 1939 to early 1941, in a series of campaigns and treaties, Germany conquered or controlled much of continental Europe, and formed the Axis alliance with Italy and Japan. Under the Molotov–Ribbentrop Pact of August 1939, Germany and the Soviet Union partitioned and annexed territories of their European neighbours, Poland, Finland, Romania and the Baltic states. Following the onset of campaigns in North Africa and East Africa, and the fall of France in mid 1940, the war continued primarily between the European Axis powers and the British Empire. War in the Balkans, the aerial Battle of Britain, the Blitz, and title: Military history of the United States during World War II text: because General Eisenhower replaced Fredendall with General Patton. Slowly the Allies stopped the German advance in Tunisia and by March were pushing back. In mid April, under British General Bernard Montgomery, the Allies smashed through the Mareth Line and broke the Axis defense in North Africa. On 13 May 1943, Axis troops in North Africa surrendered, leaving behind 275,000 men. Allied efforts turned towards Sicily and Italy. The first stepping stone for the Allied liberation of Europe was, in Prime Minister Winston Churchill's words, the "soft underbelly" of Europe on the Italian island of Sicily. Launched on 9 July 1943, title: History of United States foreign policy text: materials. The United States officially entered World War II against Germany, Japan, and Italy in December 1941, following the Japanese surprise attack on Pearl Harbor. This time the U.S. was a full-fledged member of the Allies of World War II, not just an "associate" as in the first war. During the war, the U.S. conducted military operations on both the Atlantic and Pacific fronts. After the war and devastation of its European and Asian rivals, the United States found itself in a uniquely powerful position due to the lack of damage to its domestic industries. After 1945, the isolationist pattern