When racial tensions erupt, some presidents have advanced the nation toward a more perfect union, while others have thwarted its progress.

The presidents who have made the biggest impact imagined what America could be; through their rhetoric, their leadership, or their sheer force of personality, these presidents dared Americans to join them in their vision for a better future.

This hour explores how some U.S. presidents have exerted power over the economy through various measures, including taxation, imports and exports and law making, and the effects those actions have had on the lives of American citizens.

The United States was born in the flames of violence and rebellion, and extremism has always been a part of American identity; focusing on the ways in which American presidents have reacted to extinguish or fan the flames of extremism.

America's Constitution starts with the words "We the People"; every U.S. president has faced the question of who, exactly, is included in this soaring phrase; this hour examines presidential decision-making for many disenfranchized citizens.

This hour traces the rise of America's place on the world stage; becoming a superpower has altered not just America's fate but that of the world as well; with great power comes great responsibility.