do you ever wonder how in such a wealthy nation as the US there is no public property?

That's why they call them Master Planned Communities.

millions of acres of blm land

I heard that all those empty fields, lots and forests are owned by people.

National parks and national forests.

National Parks. Forest Reserves. And Federal land out West where you can pay to graze cattle. Up in Canada we call it Crown Land & there are millions of acres of it. Am I missing something or are you kinda goofy.