A boat full of lifejackets on the Greek island of Lesbos, November 2015
Alkis Konstantinidis / Reuters

A small tent city is taking shape in Tapachula, on the Mexican-Guatemalan border, and its inhabitants are living proof of the systematic erosion of one of the foundational principles of the post–World War II international order. The residents are primarily refugees and migrants from African countries who fled political persecution, social upheaval, and economic uncertainty, taking one of the longest and most perilous migration routes in the world in the hope of reaching the United States. 

Until recently, most would have been granted a 21-day grace period to either normalize their residency status in Mexico or continue on to the U.S. border. But since the U.S. Supreme Court ruled in May that the administration of President Donald Trump can deny asylum to anyone who has crossed a third country en route to the U.S. border, Mexico has started denying Africans free passage through its territory. And

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