I believe it was because the government was afraid that they might be spies for Japan, so they thought it was safer to keep them in one place so it would be easier to keep an eye on them. It also stemmed from racism due to the attack on Pearl Harbor and the U.S. fighting against the Japanese in the Pacific.
To trade with the west indies, new england and africa
If its about taxes in America, then heres your answer.
If people make more money, then taxes will go up. Wealthier people get taxed more from the government because of their money. That's just one example
