Neither did Germany’s pre-war actions in the 1930s: remilitarisation, sending troops into the Rhineland in 1936, forced unification with Austria, and destruction of Czechoslovakia after the 1938 Sudenten crisis. In December 1941 Japan, already at war with China, attacked British, Dutch and American territories in Asia and the Pacific. The immediate purpose of Japan's attack on the United States in 1941 was to destroy the U.S. Pacific Fleet. The outbreak of full-scale conflict between Japan and China in July 1937 had little to do with the USA and its people. Mobilization began when the United States declared war on Japan on December 8, 1941, one day after the attacks on Pearl Harbor. By June 1942, Japanese conquests encompassed a vast area of south-east Asia and the western Pacific. While the United States had remained neutral in the war, it responded to Japan’s aggression in Asia with economic sanctions that caused severe shortages of natural resources that the Japanese needed for … Asked in World War 2 , Japan in WW2 , US in WW2

When Japan attacked Pearl Harbor and other American bases, it led to America declaring war on the Imperial nation. The true alliance of Japan and Germany would only come about when Japan entered the war. They did not so much 'enter' as pretty much started it. The events which led to Japanese entry in WWII happened before the start of the 20th century. On 27 September 1940, Japan entered into a fateful tripartite pact with Germany and Italy. When Did the US Enter WWII? December 7, 1941 was a "date which will live in infamy," according to Franklin Delano Roosevelt. Japan saw the United States as a potential hindrance in their plan to conquer Malaya and the Dutch East Indies to secure needed resources. For Japan, Wilhelmine Germany had been a model for a modernising, martial monarchy.

For over 2 centuries Japan had been an isolationist country, the only contact with the Western world being through the Dutch enclave in Nagasaki. While traditionally, World War II is said to have started Sept. 1939 when Poland was invaded by Germany (typical Eurocentric thinking), the war had been going on for some time in the Far East, beginning with Japan taking over Manchuria in the early 30's and then attacking and invading much of Eastern China in about 1937. On August 8, Moscow declared war on Japan and launched its armies into Manchuria.. Reasons that led to Japan to enter WW2: Or reasons for rise of fascism in Japan Nationalist – the Japanese coined the slogan ‘ Asia for the Asians’ as early as the Japan-Russia war of 1904-5. The U.S entered the war as a direct reaction to the Japanese act of war which was the bombing of Pearl Harbor. In 1940, Japan signed the Tripartite Pact with Germany and Italy, creating World War II’s Axis powers. Japan found itself on the wrong side of history during WW2 when it allied with Axis powers and invaded many countries of East Asia.

In response, Germany declared war on America, and thus further strengthened their relationship with Japan. As Japanese … Why did the US enter World War 2 in 1941? The surprise attack on Pearl Harbor by the Japanese led the United States to enter World War II. The US officially entered World War 2 on December 11, 1941.