The Mexican president responded to President-elect Trump's contention that the sea should have a more U.S.-centric designation by showing a map from 1607 during a Wednesday press conference. The map, which predates the founding of the United States by more than 150 years, labels all of North America as "América Mexicana” (“Mexican America”).

During a press conference, Sheinbaum shared her lighthearted idea while displaying the historic map. “Mexican America, that sounds nice,” she remarked, pointing to the depiction of North America under its early designation.