Speech, religion, press,assembly, and the right to petition the government. I think that speech is the most important because it allows American citizens to criticize its government when it notices flaws, without fear of punishment or retaliation. Although, some may argue that religion is the most important freedom because it was the reason the British came to American, for freedom to practice religion how they choose.
Over the course of the war, 2,128,948 men enlisted in the Union Army,[1] including 178,895 colored troops; 25% of the white men who served were foreign-born