Single women are NOT a good group to build civilization on; civilization must be built on the FAMILY. Single women are as a whole risk-averse, even cowardly. They tend to view government as a surrogate husband who protects them and provides for their needs. This leads to fatherless families, which demonstrably increase violence. Civilization is not advanced by a matriarchy.
The 19th Amendment was one of the worst mistakes of the American Experiment. A better solution would have been to allow married women a separate vote, but disallow single women from voting.
Primary schoolers should be allowed to vote....that would include Biden. If they can choose their gender...
Repealing the 19th would be a nothing burger, since no sane state would disallow their women from the franchise.