Filmmaker Ken Burns says America is “defined as much by our challenges and the dark moments as we are by our successes.” Above, the sun rises behind the U.S. Capitol Building in Washington, D.C.

WASHINGTON – OCTOBER 22: The early morning sun rises behind the US Capitol Building on October 22, 2009 in Washington, DC. The US Senate is currently negotiations on a health care reform bill. (Photo by Mark Wilson/Getty Images)