because florida copied it
So it can have a flag.
The flag show what people in Florida often do.
Flag
It mean the state seal flag
What does florida state flag has
1680
British flag,French flag,Spanish flag,Untied States flag,and Florida's state flag The flags of Spain, France, Great Britain, the United States, and the Confederate States of America have flown over Florida; these are also known as the "Five Flags of Florida." At various times in its history, at least 16 different flags have flown over Florida or parts of Florida.
Florida
because it stands for Florida
The Great Seal Of The State Of Florida with the motto
The Florida flag has a saltire, which by coincidence is similar to the Saint Andrew's cross; there is no direct connection with the saint. The Saltire was part of the design of the flag of the Spanish Empire which controlled Florida when it was first "discovered" by European explorers.