I don't believe this. "Many" perhaps in raw out-of-context numbers but as a percentage of the population, very few functioning, self-supporting and employed adults in America do not have an ID. It's simply not possible to participate in society without one. You need an ID to register a car, to drive, to vote, to bank, to get a job, to buy a house, to rent an apartment, to get water, power, gas, internet....
If you don't have an ID, you are either a child, or you are deliberately trying to exist off the record. I.e. you are here illegally or you have chosen some very fringe antisocial survivalist offgrid way of living.