An American who recently lived in Raleigh for a year was the lone American killed when explosions tore through crowds watching the World Cup final Sunday at a rugby club and an Ethiopian restaurant in Kampala, Uganda, killing at least 64 people. Nathan Henn, 25, who worked with Invisible Children, a San Diego-based aid group that helps child soldiers in Africa, was killed on the rugby field. Henn was a native of Wilmington, Del., but his family moved to Raleigh in 2007, and he lived here for about a year, his sister, Brynne Henn, said this morning in a telephone...