Can Trump Really Change the Gulf of Mexico’s Name?

Among the flurry of executive orders US President Donald J. Trump signed on Jan. 20, the first day of his second term, was one directing that the body of water historically known as the Gulf of Mexico be renamed the “Gulf of America.” The change upends centuries of convention and is already ruffling international feathers.

But before you pull out your Sharpie and start editing your map, here’s what you need to know.