Japans relationship with the US in world war 2?
Relations between the US and Imperial Japan were icy in the years before the official start of WW 2 in 1939. The US and the rest of the "free world " were disturbed by the Japanese invasion of China in 1931. Of course after the 1941 surprise Japanese attack on Pearl Harbor, the two nations were at war with one another in the Pacific theater. Only after the effects of the atomic bomb drops in August of 1945 did the Emperor and his top commanders agree to an unconditional surrender.
Leading up to the war Hitlers expansion in Europe and Japans expansion in the far east were concerns for the United States. The actual reason we declared war on Japan and a few days later Germany was Japans attack on Pearl Harbor Hawaii on December 7, 1941. The attack killed over two thousand US military personnel and civilians.
World war two was fought on two fronts. The war in Europe to defeat the Germans who were trying to overrun Europe and the war with Japan in the Pacific Ocean. The allies finally defeated Hitler and the German Army after the allied invasion at Normandy. Japan was defeated in August 1945 after the US dropped atomic weapons on Japan and the Chinese overran Japans army in China.