Florida was the smallest state in population in the Confederate States of America at the time of the Civil War.
Growth was very slow in the decades up until World War Two. Florida had 1,900,000 people. That number has now swollen to an estimated 21,310,000 in 2018.
The state's transportation routes began with Spanish and Native American trails, rivers, and streams. These evolved into wagon roads and railroads and finally paved roads for cars.
The tremendous growth in Florida (it's been growing by at least one thousand people a day for years) has put a constant strain on the local and regional road network.
This web page is an interesting way to track the growth of the Sunshine State.