The 15th, 19th, and 26th amendments all relate to voting rights.
- The 15th Amendment (ratified in 1870) prohibits the federal and state governments from denying a citizen the right to vote based on "race, color, or previous condition of servitude."
- The 19th Amendment (ratified in 1920) grants women the right to vote, prohibiting any U.S. citizen from being denied the vote on the basis of sex.
- The 26th Amendment (ratified in 1971) lowers the voting age to 18 years, ensuring that citizens who are 18 years or older cannot be denied the right to vote based on age.
Thus, the commonality is focused on expanding and protecting voting rights.