4. The cause of bringing the main opposition to Japan, the US, into the war, was the attack on Pearl Harbor, which made the US a major factor in the war.

5. After an economic crisis in the 1920s, They had to rely on imports, and found the best way to gain resources is by imperializing, and taking over territories to eventually domnita East Asia.

Causes

1. The entire global conflict began with Japan's attacks in the 1930s on China with the first step becoming the invasion of Manchuria.

2. Before 1931, conflicts began with the expansive Japanese territory, and under the pretext of the Mukden Incident, it declared war on China.

3. Japan believed that that acquiring more territory was necessary for its survival against invading foreign powers.