The fifteenth amendment is ratified giving free African American men the right to vote
Congress passes the 19th Amendment giving women the right to vote.
President Johnson passed a law that outlawed the discriminatory voting practices adopted in many southern states after the Civil War, including literacy tests as a prerequisite to voting.
Protests surrounding the age at which you can vote due the the age at which you are drafted for war specifically Vietnam.
The 26th Amendment is ratified and the voting age is lowered to 18.
During the Presidential election between President Trump and President elect Biden there was multiple report that there has been illegal voting and disruption of mail in ballots.
The Supreme Court rejects President Trump's challenge regarding the 2020 election.