who invented the drainage of south florida?

I think the seminoles.

Many different people have been involved with the drainage of southern Florida. Check this site for a history of the Okeechobee region.

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The drainage of South Florida was primarily engineered by a man named Napoleon B. Broward. He is credited with implementing the bold idea of draining the Everglades and transforming the wetlands into usable land for agriculture and development. If you want more detailed information about any specific individual involved in the drainage project, I can help you with that as well.