U.S. students don't know much about American history, according to results of a national test released Tuesday. Just 13 percent of high school seniors who took the 2010 National Assessment of Educational Progress _ called the Nation's Report Card _ showed solid academic performance in American history.

The two other grade levels tested didn't perform much better, which just 22 percent of fourth-grade students and 18 percent of eighth-graders scoring proficient or better.

The test quizzed students on topics ranging from colonization, the American Revolution and the Civil War to the contemporary United States. For example, one question asks fourth-graders why it was important for the U.S. to build canals in the 1800s.

"The history scores released today show that student performance is still too low," said Education Secretary Arne Duncan in a prepared statement. "These results tell us that, as a country, we are failing to provide children with a high-quality, well-rounded education."

Education experts say a heavy focus on reading and math under the federal No Child Left Behind law in the last decade has led to lagging performance in other subjects such as history and science.

"We need to make sure other subject like history, science and the arts are not forgotten in our pursuit of the basic skills," said Diane Ravitch, a research professor at New York University and former U.S. assistant education secretary.

Of the seven tested subjects on the national test, students performed the worst in U.S. history. Officials with the National Assessment Governing board, which oversees the tests, say the U.S. history results aren't comparable to the other tests because different students take each exam in different years.

The scores on the history test did not vary remarkably from years past; in 1994, for example, 19 percent of fourth-grade students scored proficient or better in U.S. history.

More than 7,000 fourth-grade students, 11,000 eighth graders and 12,000 high school seniors from a nationally representative sample took the test last year.

Judy Brodigan, who was head of the elementary social studies curriculum for the Lewisville, Texas, school district for a decade, said history and social studies classes aren't as much of a priority for school districts as math and reading. She noted that many states only test history and social studies starting in middle school, which means elementary school students don't' get the background they need in the subject.

"When the foundation isn't built in elementary school, these students are coming to middle school lacking crucial skills," Brodigan said. "What is means is that in what is becoming a more and more global society, American students are more and more at a disadvantage."

Educators said history is critical to students learning how to become better citizens and understanding how the country's political and cultural systems work. Students need to not only recognize leaders like Martin Luther King Jr. and Abraham Lincoln, but also understand why they were important to the development of the country.

"Overall the quality and success of our lives can only be enhanced by a study of our roots," said Steven Paine, former state schools superintendent for West Virginia. "If you don't know your past, you will not have a future."

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Christine Armario can be reached at http://www.twitter.com/cearmario

Dorie Turner can be reached at http://www.twitter.com/dorieturner