Require people to pass a basic civics test. The same one prospective citizens are supposed to take and pass before they get granted citizenship.

And maybe purge their voter registration every four years so they have to re-register.

Edit: Or go full Heinlein.

Service guarantees citizenship!

Require people to pass a basic civics test. The same one prospective citizens are supposed to take and pass before they get granted citizenship.

And maybe purge their voter registration every four years so they have to re-register.

Require people to pass a basic civics test. The same one prospective citizens are supposed to take pass before they get granted citizenship.

And maybe purge their voter registration every four years so they have to reregister.