From a New York Times op-ed article:
Roughly a third of all American high school students drop out. Another third graduate but are not prepared for the next stage of life — either productive work or some form of post-secondary education.
A recent survey of teenagers by the education advocacy group Common Core found that a quarter could not identify Adolf Hitler, a third did not know that the Bill of Rights guaranteed freedom of speech and religion, and fewer than half knew that the Civil War took place between 1850 and 1900.
In the Common Core survey, nearly 20 percent of respondents did not know who the U.S. fought in World War II. Eleven percent thought that Dwight Eisenhower was the president forced from office by the Watergate scandal. Another 11 percent thought it was Harry Truman.