WW2 Did Not Start in 1920: A Fact Check

After the Japanese bombing of Pearl Harbor in December, 1941, the United States declared war on Japan. Germany and Italy declared war on the U.S. a few days later, and the nation became fully engaged in the Second World War.

Learn about the major events from 1918 to 1941 that sparked the first phase of World War II. #WorldOnFirePBS

The Second World War took place between 1939 and 1945 and was the bloodiest conflict in human history.

Most historians agree that World War II began with the German invasion of Poland on 1 September 1939 and the British and French declarations of war on Germany two days later. Dates for the beginning of the Pacific War include the start of the Second Sino-Japanese War on 7 July 1937, or the ...

For prior events, see the timeline of events preceding World War II. Germany's invasion of Poland on 1 September 1939 brought many countries into the war. This event, and the declaration of war by ...

The immediate precipitating event was the invasion of Poland by Nazi Germany on September 1, 1939, and the subsequent declarations of war on Germany made by Britain and France, but many other prior events have ...

December 8, 1941 The United States declares war on Japan, entering World War II. Japanese troops land in the Philippines, French Indochina (Vietnam, Laos, Cambodia), and British Singapore.

When did World War II begin? World War II formally began on September 1, 1939 when Germany invaded Poland without a formal declaration of war. In support of their mutual defense treaty obligations with Poland, France and Great Britain issued ultimatums to Hitler for the immediate withdrawal ...

2009 Prelude to war: 1931-1938 Historians consider World War II to have begun when Germany invaded Poland on September 1, 1939. But events in the