Caveat to Illinois though: Voter registration closes three weeks before election day. Then when you show up to vote, the ballot sleeve must be signed and witnessed by both D & R precinct judges, and
then an on-file signature is pulled and compared with witnessed one. If they match, you're shown the booth.
It's not as bad as some. I was aghast to learn of these states where they pop a mirror under your nose, and if it fogs up, "Here's your ballot!"