Here is an excerpt from the Henry Morrison Flager Museum's website. The museum is located in Palm Beach, FL (33480):
The transportation infrastructure and the tourism and agricultural industries he [Flagler] established remain, even today, the very foundation of Florida's economy [emphasis added], while the building of the Over-Sea Railroad remains the most ambitious engineering feat ever undertaken by a private citizen. When Henry Flagler began his work in Florida, it was perhaps the poorest state in the Union. Today, thanks in large part to Henry Flagler, Florida is the third largest state in the Union with an economy larger than 90% of the world's nations. Indeed, no individual has had a greater or more lasting impact on a state than Henry Flagler has had in Florida.