Why didn't Japan ally with Britain and the US in WWII? Or why not ally and focus on destroying China, why fight on multiple fronts?

Why didn't Japan ally with Britain and the US and concentrate on destroying China? It's actually a question.

Japan has three strategic directions: north to the Soviet Union, allied with Germany, to divide the Soviet Union; south to China, to obtain war resources coal, iron, copper, food; east to the Pacific Ocean, to occupy South Asia, to obtain the oil of Indonesia, Australia's iron, aluminum ore, Vietnam's rubber, Burma's timber, the Straits of Malacca in Singapore and Malaysia.

From ancient times to the present day, war has only one purpose: resources. 1937 invasion of China, *** counted 4.3 million troops (including Guanzhou and Guanzhou), by 1941, has been implemented by the Chinese army to counter-encircle, due to Japan's lack of resources, can not be a long-term war. Coupled with 1942, the Chinese Expeditionary Army completely eliminated the Japanese army in Burma, the peripheral war Japan has been lost, the Chinese battlefield and was compressed by the national **** two-party forces to North China, Central China, Northeast China, into the war quagmire.

Japan, if allied with Britain and the United States, the Soviet Union in the Western Front battlefield no pressure, will be freed up to take out the Japanese Kwantung Army, Japan is also in a two-front war. If allied with the Soviet Union, the Soviet Union has no pressure on the Eastern Front, will take out Germany, Japan is also in a two-front war.

Regardless of who Japan is allied with, it is in a two-front war, and only by not invading China can it preserve itself. Although Japan is strong, but the national volume is too small, although China is weak, but the national volume is large, both with China alone, is ultimately will fail. It was because of this that China was freed up to open a second front in Burma after stabilizing the domestic front. Britain and the US helped China entirely after the bombing of Pearl Harbor in the US, and China had been fighting Japan alone for more than five years. Because of the lack of heavy weapons, it could only impose a strategic compression on Japan.

The war is not a theory of weapons victory, a country's comprehensive strength, is to determine the victory or defeat of the war. 1940, the Japanese military department issued an order to prohibit bayonet fighting with the Chinese army, allowing retreat. Therefore, the war of resistance against Japan after 1940, there was no more scenes of bayonet fighting between the Chinese and Japanese armies. The reason is: as long as the melee, Japan's artillery, airplanes can not play a role, close physical combat Japan can not fight China, often leading to the destruction of the whole army.