The US never enters the war because Pearl Harbor events never take place, leading the US to remain neutral in the war. Japan focuses its strength on Asia and Pacific Islands, gaining a foothold on most of Asia.
Russia gets pushed back by Nazi forces from the West, and Japan leads attacks from the East. This causes Russia to surrender, leaving Britain as the main focus for the Nazi attacks.
Because most of Asia and Europe is now under Axis control, it eventually leads to the North and South America getting invaded by The New Axis Regime. (Japanese Controlled Asia & Germany Controlled Europe)