These were called the Palmer raids and were a part of the red scare. He did it because they were accused of being communists and anarchists, or were just too much left and liberal. This was out of fear that they might get enough people and start their own revolution in the country.
Because he was assassinated. He was assassinated very soon after the war ended and there was no time to do everything he wanted to do. Other people took over and started implementing reconstruction ideas and eventually it turned into more exploitation and segregation and racism.
He called the imaginary barrier the "Iron Curtain". He used this image to oppose the Soviet union expansion, and keep in communism in check.
Hope this helps!!!:)
The triangular trade route or the Silk Road
The biggest issue is by technology.
