because usually people had an easier time going on estalished trail like the silk road it was dangerous but they used it up until the 15th century and it takes longer to make a new trail
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.
Government and the feelings of our people.” Yet, only fourteen months later, Jackson prompted Congress to pass the Removal Act, a bill that forced Native Americans to leave the United States and settle in the Indian Territory west of the Mississippi River.
