For one, this is a problem world wide, but OK, you can try to solve it for the US.
But for another, not everyone has a state ID card. In particular the 7.1% of the population that does not have U.S. citizenship will have varying amounts of US documentation, depending on how long they're in the US for and whether they're there legally.
And you really want to be able to sell tickets to tourists.
But for another, not everyone has a state ID card. In particular the 7.1% of the population that does not have U.S. citizenship will have varying amounts of US documentation, depending on how long they're in the US for and whether they're there legally.
And you really want to be able to sell tickets to tourists.