Saul Servin sells Mexican candy and party planning services at Dulceria El Girasol, his store on the corner of Shields Boulevard and SE 29th Street in Oklahoma City. He remembers parents weighing the cost of a child's birthday party against the need to save - in case one parent got deported.

"We were all feeling a lot of anxiety because we didn't know what was going to happen," Servin said about his community. "We didn't know if we, as immigrants, were going to be able to stay in this country."

That was three years ago when the Trump administration encouraged local law enforcement to identify,...