In these fiercely-polarized times, the presidential historian reminds us that Americans' freedom has been tested – and has survived – much worse.

In a divided country, an overwhelming number of people agree that we need more civic education to pass on the American way.

As we celebrate 250 years of U.S. independence, let us seize this moment not merely to look back with gratitude, but to look forward with purpose.

In these fiercely-polarized times, the presidential historian reminds us that Americans' freedom has been tested – and has survived – much worse.