Somebody hasn't played cities skylines 2. It's all single occupant housing.
Real actual answer: only one state has an average occupancy of 3 people to a house, Utah, and the rest don't crack that number. Our most recent census (that thing almost none of your friends replied to) shows more than 3 times the ACTUAL number of privately owned homes in 2021 (83 million), and you could've had these same statistics in front of you and verified in seconds if you actually gave a shit about information instead of just arguing like a parrot.
You are quite literally showing me a graph that proves my point, but I'm guessing you don't understand the info shown here. 70% peak homeownership is perfectly in line with what I just said, the simple conclusion was ~2/3 from that data.