Abolishing slavery in the United States.
Guaranteeing due process and equal protection rights to all citizens.
Guaranteeing the right to vote for all U.S. citizens.
Granting women the right to vote.
African-American woman Rosa Parks's arrest after her refusal to move to the back of a bus triggers a citywide boycott of the bus system.
Rev. Dr. Martin Luther King, Jr. delivers the historic "I Have a Dream" speech.
Employers pay all employees equally for equal work, regardless of whether the employees are male or female.
The U.S. Supreme Court decision in Obergefell v. Hodges declares same-sex marriage legal in all 50 states.