The french helped tremendously with the american independence movement. They were still very bitter about the loss of the french and Indian war, and jumped at the opportunity to help defeat the British. After the war ended, France had its own revolution, which was inspired by and based off the american war for independence. A few american figures even helped out with the french revolution.
Religion is the answer; education, money, and occupation determine what class you are in.
These things happened during the time of the Mexican Revolution. General Victoriano Huerta came after the assasination of Madero and Pino Suarez, but before that, Madero and Suarez were pushed to resign in 1913. The ouster of Huerta failed. The failure of Huerta's ouster resulted to a civil war.
Actually this is False. Some north colonies had slaves in them.