[Mr Downtown]

"Public trust land" is land that has specifically had a restriction placed on it during transfer. That's not the same as land owned by the government being sold off for homesteading and settlement as contemplated.

The state of Illinois deeded the site of Jackson Park to the South Park Commission with the express restriction that the land “be held, managed and controlled by them and their successors, for the recreation, health and benefit of the public, and free to all.”