What’s the Cambodia-Thailand Peace Declaration and Why Is Trump Involved?

Long-simmering tensions between Thailand and Cambodia escalated to deadly violence on July 24, setting off five days of military clashes at multiple spots along the roughly 800-kilometer (500 mile) border. The fighting between the two countries was the deadliest in recent history, leaving almost four dozen people dead and more than 300,000 people displaced from their homes.

The clash was part of a broader disagreement with origins stretching back more than a century and involving parts of a region known as the Emerald Triangle, where the boundaries of Thailand, Cambodia and Laos meet.