I had to get a new driver's license at the Massachusetts RMV. At the end of my business, the clerk asked me if I wanted to register to vote.
Obviously I'm already registered. But I took a look at the registration form. It did not ask anywhere AT ALL whether I was a citizen.
I asked the clerk whether I had to prove I was a citizen to register. She looked at me blankly and then searched the form.
In tiny print above the signature line was a boiler plate statement, and buried within that paragraph was a statement like: "I hereby certify that I am a citizen of the US." It was very easy to miss. If I hadn't asked, I never would have noticed it.
But she said it was not policy to ask for proof of citizenship, and I could easily have registered if I was an lllegal alien.
So much for government officials being better at making sure only citizens vote in US elections.