Donald Trump renamed the Gulf of Mexico. Here's what that means legally and politically, according to experts.

On his first day in office President Donald Trump signed a slew of orders. Everything from Leaving the World Health Organization to renaming the Gulf of Mexico to declaring there are only two genders.

Donald Trump announced a new name for the Gulf ... Both Mexico and the U.S. are a part of the International Hydrographic Organization: an intergovernmental organization that ensures the world ...

It borders five U.S. states and takes in runoff from 33 major U.S. rivers, making it one of the largest watersheds in the world. The Gulf of Mexico basin formed some 300 million years ago ...