A week or two ago I was surprised by a letter from the local judicial district. Eh? Yeah, I’d been summoned for jury duty. Cool or not cool, that was definitely a first for me. 
However, I was pretty sure that I would be excused because, last I checked, I’m not a citizen. So we filled out their questionnaire (which includes a question about citizenship), sent it off, and waited.
This week we got a reply from the court that, as expected, I had been excused from jury duty, so it’s all cool, but, now I’m wondering: Where the hell did they get my name anyway? Is it because I pay (state/federal) taxes? Is it because I have a driver’s license? How does that work?
driver’s license. I believe at least that’s how most states do it.
for a while, it was based on registering to vote (citizenship needed there), but then folks were NOT registering to vote specifically because they didn’t want jury duty
but folks will always do their driver’s licenses 
Then how did they do that before having a driver’s license was just something that you work on getting at 16?