Let us look at history. Based on the data today, the fact is that almost all homo sapiens immigrated elsewhere from Africa. If you want to ignore that, then in the recent four-five centuries, native Americans tribes owned this land. If you want to go far back, 4.5 billion years ago, no one owned nothing. It is just a matter of timeline if you think of it.

I feel fortunate for the opportunities I have had but I graduated on scholarship based on merit, paid the social security taxes that I will never claim and will potentially help the unemployed here.

Sharing some detailed data to help you with the numbers to address your questions, https://immigrationforum.org/article/immigrants-as-economic-contributors-immigrant-tax-contributions-and-spending-power/