> entitles anyone to own land in the first place?

by fiat, land can be owned.

The first land was obtained through war and conquest (from native american indians). Those who worked and produced wealth used it to purchase the land from the crown (or whatever gov't that did the conquering).

If you want to change this, you either must convince everybody (including existing land owners) that your system is better. Or, raise an army, and take it by force (as what was originally done to the native american indians).