If this refers to the democratic republic body of governance like in the U.S. Then from the three body; executive, legislative and judicial. I would presume that the executive has varied greatly over the years, in that, there can be changes from the office and people in power.
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.
The gradual muslim conquest by the mughal empire.
It protects peoples ideas
C. was passed to keep America ethnically uniform.
