Marquez-Marquez v. Gonzales, 455 F.3d 548 (5th Cir. Jul. 6, 2006) (under the undisputed facts Moreno did not automatically obtain U.S. citizenship pursuant to section 301(g) of the Immigration and Naturalization Act, 8 U.S.C. 1401(g), by virtue of her adoption by a U.S. citizen).