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.
Answer:
In Lincoln's mind, the railroad was part of the Civil War effort. The new line would support communities and military outposts on the frontier. ... A transcontinental railroad, Lincoln hoped, would bring the entire nation closer together – would make Americans across the continent feel like one people.
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Answer:
yes, the founding fathers wanted to make sure that rebellions would not be a common thing
Well, it decreased the demand of Slave Labor.
Back then, the technology advancement , especially in agricultural sector, significantly increased the total production. This cause the demand of overall labor decreased. The northern US, who utilized more of this advancement more than their southern neighbor, manage to produce hundred times more output than the southern who still depended on their slave labor