Webhenry morrison flagler is best known for his development of florida’s east coast. He was responsible for building the florida east coast railway from daytona to key west. Flagler made a significant contribution to florida’s economy through tourism and agriculture. Webflagler and plant’s entrepreneurial efforts were crucial in making florida one of the largest states in the united states with an economy larger than 90% of the nations in the world (henry. Flagler, in an effort to regain their dominance, essentially invented the oil futures market by issuing certificates against the oil stored in their own company’s pipelines.