I'm white and hang out with mostly white people who don't understand how scary this is.
I ask them if they can prove to me - right now - that they're a citizen. Lots of them legitimately think a Driver's License is enough.
I explain that it is not proof of citizenship and that lots of people have licenses without being a citizen. So if they were brown, they might be arrested based on their lack of papers.
And once arrested and sent to a camp, your ability to produce any documentation you may have diminishes to almost nothing.
Demand your white friends show them their green card or birth certificate.
If you think that's a joke, ask around. I've been asked that twice in my life. But because I'm not Default American™, I have to prove a lot harder that I was born here.
Yup. Everyone is quick to forget how the US treated Irish, Italian, and Jewish people in past generations. There really is such a thing as "not white enough", and when these jerks run out of people to pick on, that's next.
Get a passport card. It's valid ID, proves you're a citizen, and doesn't have your address on it so cops and the fascists from ICE don't learn where you live. Keep the original passport somewhere secure, like you said
My cousin and his wife adopted their son from Guatemala. Great kid, growing up to become an admirable adult. They're right-wing Trump supporters in the state of Florida. I know they voted for this shit, and probably don't conceive of the idea this could ever harm THEIR son. But all it takes is the fact that he doesn't look American enough to some racist in a uniform for him to get snatched up in a sweep. Really hope he doesn't face this kind of harassment, but now its become much more likely.