14th (July 9, 1868) - Defined what it means to be a US citizen. It prohibits states from reducing the privileges of citizens and ensures each citizen the 'right to due process and the equal protection of the law'.
15th (February 3, 1870) - Gave all men the right to vote regardless of race or color or whether they had been slaves.
19th (August 18, 1920) - The 19th amendment gave women the right to vote. It's also called women's suffrage.