what do the 15th, 19th, and 26th amendment have in common?

voting rights
religious rights
african american rights
womens rights

The 15th, 19th, and 26th Amendments all deal with voting rights.

The 15th Amendment, ratified in 1870, prohibits the denial of voting rights based on race, color, or previous condition of servitude, thus ensuring African American men the right to vote.

The 19th Amendment, ratified in 1920, grants women the right to vote, guaranteeing that voting rights cannot be denied on the basis of sex.

The 26th Amendment, ratified in 1971, lowers the voting age from 21 to 18, ensuring that citizens 18 years and older cannot be denied the right to vote.