Timeline (Axis China)

Creation of Axis Powers
The leader of the German Reich, Adolf Hitler, approached the Republic of China's leader, Chiang Kai-shek in 1937. He proposed that China join Germany and Italy in an alliance. Hitler needed a stronghold in Asia against the Communists, and as the Chinese government was in civil war with the Communist Party of China. Chiang Kai-shek agrees. The Axis Powers are created later that year.

German Intervention in the Chinese Civil War and Sino-Nazi Relations
German Forces were sent to China to fight against the Communists, led by Mao Zedong. The additional forces were put on the front lines, which build a relationship between the Germans and Chinese. The Nazi's also consider the Chinese on the same level of eugenic superiority as the French and British (a level below the Germans and Aryans). By November 1939, the combined forces of the Axis Powers managed to force the Communist Forces into Tibet and the South-West of China. After the communists had been driven away from China, China and Germany had to deal with the invading Japanese forces.

Second World War
In January 1940, Japan went to the United States and the United Kingdom, requesting help against the Chinese and Germans. Both, especially the UK, were already worried about increasing threat of the Axis Powers in Europe and East Asia. And with the increasing possibility of a German invasion of Poland (which is delayed in this ATL due to German forces in China), the United Kingdom and the United States issue a warning to Hitler, demanding they withdraw their troops from Japan and stop intervening in any affairs in East Asia. Hitler ignores this warning. The Allied Powers, including the United States, declare war on Germany the following day.