Rewrite the paragraph to make it more precise and formal:

The Okefenokee is the biggest swamp in North America. Part of it was helped by Franklin Roosevelt when he took a bunch of it and made it into a wildlife refuge. Before that, people could take trees away. Now the swamp has loads of animals.

The Okefenokee Swamp is the largest swamp in North America, encompassing a substantial area that was thoughtfully preserved as a wildlife refuge under the guidance of Franklin Roosevelt. Prior to this initiative, the swamp was subject to tree removal by individuals. As a result of these conservation efforts, the swamp now thrives as a diverse habitat abundant with numerous animal species.