An immigrant looks over his U.S. citizenship certificate following a naturalization ceremony held at the U.S. Citizenship and Immigration Services (USCIS), office on May 17, 2013 in New York City. One hundred and fifty immigrants from 38 different countries became U.S. citizens at the event. Some 11 million undocumented immigrants living in the U.S. stand to eventually gain American citizenship if Congress passes immigration reforms currently being negotiated.