The majority of adults in the United States have high school degrees
Nearly nine in 10 adults have a high school education, a significant increase of more than 75 percent since the mid-1960s, when nearly one in two adults was high school educated. The rise has been the most dramatic among African Americans.
Percent of adults age 25 and older with at least a high school degree

Source: U.S. Census Bureau, Current Population Survey, 2011.