Is it about land superficy or about ownership? Can we establish a clear framework here instead of constantly jumping from one wishy washy thing to the other?
You aren't the sole owner of your house either. Even without a mortgage you are not. So if someone adhere to the social contract in your house I assume you let them in to do as they please (within the limit of the contract of course.)
It’s about how to manage shared resources amongst people who all have equal claim, which is everyone who has agreed to the social contract. When you agreed is irrelevant.
Frankly, I would argue that many people born in the US do not hold up their end of the social contract, and should thus take a backseat to immigrants who would come here and care deeply for the social contact in their place.