What was a common characteristic about groups denied voting rights before the 15th, 19th and 26th amendments were ratified?

What right did the Nineteenth Amendment grant to women?

Which age did the Twenty-Sixth Amendment extend voting rights?

According to the Fifteenth Amendment, on what basis could citizens no longer be denied the right to vote?

Which one of the following is NOT one of the ways southern states tried to deny African-Americans the right to vote under the Fifteenth Amendment?