There are approximately eleven million undocumented people living in the United States, and most of them have family members who are U.S. citizens. There is a common perception that marriage to a U.S. citizen puts undocumented immigrants on a quick-and-easy path to U.S. citizenship. But for people who have entered the U.S. unlawfully and live here without papers, the line to legal status is neither short nor easy, even for those with spouses who are...