For millions, the election of Barack Obama marked a new era of hope. This four-part series tells the story of how he tried to reshape America as told by his inner circle - and the president himself.

With exclusive interviews from president Obama and his White House team, episode two tells the story of Obama's greatest legacy: healthcare.

Episode three explores how Barack Obama set out to end George Bush's wars in the Middle East and reset relations with the rest of the world. In Cairo he speaks to the Arab world, calling democracy a human right.

The last instalment of this definitive account of Obama's presidency tells how Obama got re-elected for a second term and tried to tackle America's most intractable social problems - guns, immigration and race.