In the U.S., 18-year-olds have had the right to vote everywhere since the 26th Amendment to the U.S. Constitution was ratified in 1971.
But South Dakota never ratified the amendment.
That doesn’t stop it from having effect here, since new amendments require only three-fourths of states to ratify them, rather than unanimity.
This year, Sen. Chuck Jones, R-Flandreau, is proposing hopping on that bandwagon. He’s proposed a joint resolution to make South Dakota the 43rd state to ratify 26th Amendment.
From time to time, this happens. Mississippi made news last year when it belatedly ratified the 13th Amendment, abolishing slavery, 148 years after it took effect. (Again, slavery had already been abolished. Mississippi had just never officially endorsed the change.)
The 26th isn’t the only amendment South Dakota hasn’t ratified. Among the first states to back Prohibition, South Dakota never ratified the 21st Amendment repealing the nationwide alcohol ban.