After George W. Bush and the Great Recession, the Americans needed a new face of leadership. Barack Obama was that new face.
His speech explores race relations in the US and his main points are that racial tensions are because “It was stained by this nation’s original sin of slavery”. (ll.7-8)
Also, that they can overcome these race issues if they work together, “But I have asserted a firm conviction […] that working together we can move beyond some of our old racial wounds” (ll. 7-8)