Here is something parents might want to ponder as they celebrate Thanksgiving with their children: A friendly argument around the dinner table could be a good thing — especially if it involves current events or history.

A new study found that students from families that frequently discuss these topics learn more in college than students from families that don't.

Last fall, the Intercollegiate Studies Institute surveyed 14,000 randomly selected freshmen and seniors at 50 colleges. Each student was given a 60-question, multiple-choice civic literacy test that focused on American history, government, international relations and economics. Students also were asked about their family experience, including their parents' marital status, the frequency of family conversations about current events and whether English was the primary language spoken at home.

The data demonstrated that higher quality family life led to students learning more about U.S. history and institutions. This finding is important for all Americans because the survey also showed that students who learn more about these subjects during college also tend to be better citizens, showing a greater tendency to vote and participate in other civic activities.

The students who did the best on the test were those who came from homes where the parents were both college graduates, were still married and living together, spoke English to their children and frequently talked with them about current events and history. On average, seniors who enjoyed all these advantages scored 6.52 points higher than students who lacked them.

The test also showed, however, that parents need not be perfect to give their son or daughter a significant advantage. In fact, the factors that improved student performance the most turned out to be those that parents can most readily control.

The most significant factor, for example, was frequent family discussion of current events and history. It typically added 2.32 points to a senior's score. Among students who were U.S. citizens, using English as the primary language at home — something immigrant families can strive to do — was the second most important factor. It added 1.80 points.

The combined effect of parents staying married, speaking English at home and frequently discussing current events and history added 4.82 points to a senior's test score. That was five times the gain from having a father who graduated from college and six times the gain from having a mother who graduated from college.

The iconic image of an American family sitting down to dinner and a lively conversation has been captured in our popular culture. ISI's survey demonstrates again that there is deep wisdom in this vision of family life.

It also reaffirms another American value: We are a merit-based society. How parents choose to raise their children matters more than where they were born or whether they went to college in determining whether those children become successful students and participants in civic life.

Now, that's worth discussing over turkey and stuffing.

Josiah Bunting, president of the H. Frank Guggenheim Foundation, wrote this commentary for the Los Angeles Times.