Yes but the topic wasn't about voting?

OP was asking how there's huge communities of undocumented people in the US and how they manage to work and live without legal status. Which would be an unusual thing in almost any country. The logistics of doing so is a valid question (how do you drive to work, how do you find housing, how do you get healthcare, etc). The answer is many state and federal policies support having millions of undocumented people in legal limbo indefinitely, by offering them pseudo-legal status or loopholes.