The kitchen table, round and glass, with wooden legs, sits in a sunlit corner of Alejandra Carrera and Clemente Flores’ apartment. It is one of the first things visitors see. To the outsider, it’s a nice table. To the couple, married 26 years, it’s a symbol of their economic progress over the last decade. They bought it new, on sale, last year. “We have always had to buy second-hand,” Flores said. Puro segundo. Their Aurora apartment is a newer one-bedroom, small like the others before it. But it is a big improvement from the roach-plagued aging buildings they could afford when they moved to Colorado 13 years ago. Carrera, 66,...