EDINBURG — For Carmen, as for many people, a college degree represents an opportunity for a better future. But her future is far more difficult to ascertain than it is for most U.S. college students. She is one of several thousand undocumented immigrants attending Texas universities and colleges, according to the Immigration Reform Coalition of Texas (IRCOT). Carmen — who declined to give her last name for fear that her current employer could face repercussions — came to the U.S. from Chiapas in 1992 at age 14, unsure of what was happening or what her future held. Now, at 32,...