2 big reasons.
first, the Japanese had almost no Natural Resources. Rubber, tin, iron, et cetera are found in abundance in SE Asia, but not in Japan. Japan wanted an empire, and empires need resources. So, the thinking was, "why not take it?" And take it they did.
Japan came up with this "Greater East Asia Co Prosperity Sphere" as spin and P.R. to get the Southeast Asian nations to buy into this idea. It was pure hokey.
Second, the Japanese fought with the Allies in World War I. They expected to get Germany's pacific colonies and more territory at the Treaty of Versailles conference. The Western powers virtually ignored Japan and treated the Japanese representatives like 2nd class citizens. This did not sit well with Japan, so Imperial Japan felt it was their right and their due to go GET an empire. If you aren't going to be given some of the spoils of war after fighting on the winning side, you're going to go take it.
I say this not to defend Japanese actions during World War II. I strongly condemn Japanese atrocities during the War. A Japanese artillery shell permanently blinded my grandfather and killed many of his unit on Papua New Guinea in 1942. Nevertheless I hope this explains why the Japanese invaded southeast Asia.
During World War II, Japanese controlled much of Southeast Asia from European nations. When the Japanese ruled the area, it showed them that Europeans were far from invincible. When the war ended, the Japanese left Southeast Asia. Europeans then wanted the land back. But many of the people of Southeast Asia did not want to live under the Europeans any longer. Southeast Asia eventually won independence and new nations were formed.
sushi came from southeast asia
To dominate the Pacific region and possess all of its resources. The Japanese believe they are superior to all other nations, and at that time, they were trying to create an empire across all of east Asia.
Western Pacific Ocean
by getting house arrest
The Japanese shared similar feelings to Hitler. Invade now, Think later. The Japanese wanted to invade the world with Hitler, so it would be common sense to think that they had a feeling of pure hatred toward the rest of Asia, and indeed the world.
The Eastern Hemisphere, slightly above the equator.
Well, the involvement was that the entire area was invaded by Japan. Large portions of China and Korea were occupied by the Japanese. Many of the island nations, including the Philippines were invaded by the Japanese. In most cases large groups of natives worked with US and British forces to establish undergrounds and guerrilla forces to fight the Japanese.
Maybe because Japan invaded and occupied Korea. Then tried to invade China.
Southeast Asia.
Yes, it is in southeast Asia.
Southeast Asia