In Australia, a person is fined if they do not vote.
What do you think would be the outcome if America made voting mandatory and people were fined if they didn't? From my own experience, not enough educated people vote in the U.S. Could you imagine how this would change things? We fought so hard for our voting rights, especially women, so why don't more people exercise their right to vote? Is it that we feel that our voice doesn't make a difference?
Food for thought.