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 holds the distinction of being the largest swamp in North America. Its preservation and transformation into a wildlife refuge owe a debt of gratitude to the efforts of Franklin Roosevelt. Prior to this intervention, the swamp was subject to deforestation. However, as a result of these protective measures, the Okefenokee Swamp now thrives as a habitat rich in diverse animal species.