Why did Japan bomb Pearl Harbour?
Japan needed oil to continue the war with China and French Indochina. The US imposed an embargo on oil exports to Japan in 1941, making the situation critical. They already knew that conquering Siberia was going to be impossible (Japan tried in 1938 and 1939, but were defeated by the USSR). So, they decided to take Malaya and Dutch East India. However, the US wanted to stop Japan’s expansion and they transfered the Fleet from San Diego to Hawaii and also increased military presence in the Philippines (an US colony at the time). Pearl Harbor was a preemptive strike to destroy the US Pacific Fleet and they also invaded the Philippines.