RIO DE JANEIRO, BRAZIL - On a recent Saturday morning, Cristina Oyarzo, a 41-year-old historian who lives in the coastal city of Iquique, Chile, near the border with Bolivia, was very tense. Like many other residents, she saw on social media that there would be an anti-immigrant demonstration a few hours later and was worried that things would get out of hand. She was right.
In recent months, Iquique has become a stop for many Latin American migrants to escape poverty and political turmoil in their countries. Tensions between the migrant crowd and the local population have steadily . . .