Is it illegal to drive with 8 people in the car in a 7 seater van?

In the U.S,the only rule that would be similar to that would be that you cant put people on the back of a pick-Up.So,the answere to the question you just asked is,yes you can have as many people in your vehichle as you need.just make sure you do not over load your car with excessive amounts wate,causing a delima with other people around you.Hope my answere helps.