Slavery generated four amendments. The 13th Amendment, ratified in 1865, abolished slavery. The 14th Amendment was adopted in 1868 to protect the civil rights of former slaves. It granted citizenship to all people born in the United States. Two years later, the 15th Amendment declared that the right to vote shall not be abridged on account of race or previous condition of servitude.
The 16th Amendment (1913) authorized an income tax, which the Supreme Court had declared unconstitutional in 1895.
The 19th Amendment extended the vote to women.
The 22nd Amendment, adopted in 1951, limited presidents to two terms.
The 26th Amendment, adopted in 1971, extended the vote to 18 year-olds.