Emiliano Rodríguez Mega | The New York Times

Jorge H. Martínez, owner of a small Mexican company near the U.S. border, has seen how President Donald Trump’s threats of steep tariffs have upended markets, bent geopolitics and thrown businesses into uncertainty.

In Mexico, where tens of thousands of people have disappeared, the robust operation to quickly find the remains of three foreigners, from Australia and the United States, felt like a rare exception.