CIUDAD NEZAHUALCOYOTL, Mexico (AP) — Last year, the Hernández Pacheco family began to notice a number of Haitians arriving at an apartment across the street from their medical clinic on the outskirts of Mexico City. Their two-story, mint-green office sits on a small street in working class Ciudad Nezahualcoyotl. The Haitians stood out among the tamal vendors and street merchants, sitting out in the sun to warm up in the chilled high-elevation air.