Spanish, French, or English?

First and foremost, it is important to state the obvious fact that the Spanish empire held a circumstantial hold on the florida territory for some time. That being said, it is not necessarily true that the Spanish empire was the most successful in adjusting to florida, perhaps just more invested in it. All three empires did in fact send settlers to Florida, however the English controlled the New England territory, and the French territory further north. The spanish however, did not control much territory  on the atlantic coast. (with exceptions in mexico and south america) Therefore, the Spanish may have been able to dominate the Florida territory as time went on simply because they invested more into it.