Just days before he leaves office, Mexican President Andres Manuel Lopez Obrador (AMLO) has decided to take control of a port and quarry owned by Vulcan Materials Company, an American construction giant. Last month, Mexico accused the US of meddling in its elections via USAID. These actions have created a stir and increased tensions between Mexico and the United States.

The area affected is located on Mexico's beautiful Caribbean coast, just south of popular tourist spots like Cancun and...