first answer:
Japan was desperate for resources. (Apex)
second more correct answer:
Japan's brutal military aggression in China led the United States to impose trade sanctions against Japan in the hope that this would cause the Japanese (Army) leaders to end their barbaric war on China. The conquest of China had become the Japanese Army's reckless obsession for decades. US trade sanctions angered the Japanese Army leaders to the extent that they began thinking of going to war against the United States. These Army leaders who were having difficulty defeating China (a poor, weakened, divided and almost 'third-world power'), now believed that attacking the much more powerful United States would help their situation. They also decided to ally themselves with Hitler's Germany & Mussolini's Italy. The Japanese signed the Tripartite (Axis) Pact on September 27, 1940. Hitler begun urging the Japanese to attack the British & Dutch in Asia as soon as possible, as a way to help him win the war in Europe.
Another significant affect: Japan's war of conquest against China exposed (by photographs & movies) these Japanese as dangerous, brutal and barbaric mass murderers to the free world.
In the end, the Japanese invasion of China in 1937 triggered the Japanese to attack the United States, Britain (& Commonwealth), and the Netherlands in December 1941. The Japanese attack on the US then triggered Hitler & his allies to declare war on the United States a few days later. The addition of the United States to the war in Europe & Asia caused the complete & utter defeat of Germany, Italy, Japan, and the smaller Axis nations in 1945.
japan was desperate for resources.
japan was desperate for resources
China could not fight Japan.
japan
The simple answer is because China had in the 30's been invaded by Japan, as part of Japan's ambitions into creating an empire. After Pearl Harbor, America sought every means possible in terms of fighting Japan. Supplying China was done as an intention of broadening Japan's war front. The Chinese guerillas had been harrassing the Japanese despite Japan's cruel repression of China, and with American weapons, they were greatly aided with these supplies which they used to divert and pull sections of Japan's army from other theatres of the war where the allies were, thus as I said, expanding the war front for the Japanese, forcing the Japanese to be fighting in all areas.
Japan was desperate for resources
japan was desperate for resources.
japan was desperate for resources
Japan's fierce military aggression in China led the United States to enact trade sanctions against Japan in the hope that this would make the japanese leaders to end their brutal war on china
Western powers restricted their trade with Japan.
Japan's fierce military aggression in China led the United States to enact trade sanctions against Japan in the hope that this would make the japanese leaders to end their brutal war on china
Japan was desperate for resources.
Japan was desperate for resources
Japan was desperate for resources.
Japan was desperate for resources. (Apex)
Japan was desperate for resources
Western powers restricted their trade with Japan.