If students fail history, does it matter?

CNN:

If there’s a student anywhere who would be able to answer a trivia question about President Abraham Lincoln, it would be on the marble steps of his memorial in the nation’s capital.
But a summertime visit there backed up recent test results that showed the majority of U.S. students don’t know the most basic facts about the country’s history — Lincoln and all.
Test results released in June showed that fewer than one quarter of all students are “proficient” in American history.