Citizens cannot sue states in federal courts (some exceptions apply) (1798)
The President and Vice President are elected on a party ticket (1804)
Abolition of slavery (1865)
Equal protection clause (1868) - states must provide "due process" and "equal protection of the law" to all citizens; every person born in the US is a citizen; immigrants can become naturalized
All US male citizens have a right to vote (1870)
Federal government can tax incomes (1913)
The people can elect US Senators (1913)
Prohibition (1919)
All US female citizens have the right to vote (1920)
The President is inaugurated in January; Congressional sessions start in January (1933)
Repeal of prohibition; states can make their own laws about alcohol (1933)
The President cannot be elected for more than two terms (1951)
Citizens in the District of Columbia have the right to vote for President (1961)
No voting fees (1964)
Presidential succession - Vice President becomes President (1967)
Citizens 18 years of age and older have the right to vote (1971)
Congress must limit when and how much its members are paid (1992)