A report (PDF) by the America's Promise Alliance shows that urban students are graduating from high school at alarmingly low rates. According to the report, "Only about one-half (52 percent) of students in the principal school systems of the 50 largest cities complete high school with a diploma." The report covers the country's 50 largest cities and documents a distinct advantage of suburban students over urban dwellers. For example, in Baltimore's metropolitan area, only 34.6 percent of students in urban districts who entered high school in 2003 graduated, while 81.5 percent their suburban Baltimore peers finished--a gap of 47 percent. Even worse: fewer than one in four students finishes high school in the Detroit City School District.