What was the primary reason for the increase in tourism in Florida in the 20th century?

The primary reason for the increase in tourism in Florida in the 20th century is closely tied to the control of salt marsh mosquitoes. In the early 1900s, Florida's landscape and its warm, humid climate made it an ideal habitat for mosquitoes, which posed a significant nuisance and health risk to potential tourists. As public health measures improved, and specifically, as effective mosquito control methods were developed and implemented, the overall experience for visitors became much more pleasant.

The reduction in mosquito populations allowed for outdoor recreational activities to flourish, making beaches, parks, and other natural attractions more enjoyable for visitors. Consequently, this improvement in public health infrastructure laid the groundwork for Florida to become a favored destination for both domestic and international tourists. It helped address health concerns that would have deterred travelers from visiting the state, thus significantly contributing to the growth of the tourism industry during that period.

While the introduction of new attractions, expansion of transportation networks, and development of resorts and hotels all played important roles in enhancing Florida's tourism appeal, the successful control of disease-carrying mosquitoes was fundamental in creating a safe and appealing environment for tourists, enabling all these other developments to flourish.