Based on your first comment, I already knew you were neither intelligent nor being reasonable, but this comment also shows you have no idea how even basic things work.

The Federal government in the US controls the borders and a Federal agency, Customs and Border Protection (CBP) enacts border policy. Just as in every country in the world to legally enter that country you must pass through customs and passport control in any airport, seaport, border crossing, or otherwise. Whether that's in Florida or elsewhere.