Doesn’t Miami itself have a GOP mayor?
Yes, he ran for POTUS and dropped out
Re: Miami GOP Mayor
That is largely because of the 1960 First Wave Cubans.
They were, and still are, mostly Republicans.
The 1960 Cubans (and their children and grandchildren) were mostly European and North American transplants.
They were not Hispanic or African or Caribbean.
They were the business owners and professional class of Cuba.
By 1960, they had made Cuba the wealthiest country in Latin America.
Then, Fidel Castro and his brother burned it to the ground.