The sixth President of the United States, John Quincy Adams fought for George Washington, served with Abraham Lincoln in Congress, witnessed Bunker Hill, and as a staunch opponent of slavery, foresaw that slavery would lead to civil war between the North and South. He is, in fact, the only major figure in American history who knew both the founding fathers and Abraham Lincoln. He negotiated an end to the War of 1812, engineered the annexation of Florida, and won the Supreme Court decision that freed the African captives of The Amistad. He served his nation as minister to six countries, secretary of state, senator, congressman, and president. His opposition to slavery inspired John F. Kennedy's Profiles in Courage. Yet he remains one of the least-known presidents in our nation's history. We'll talk with biographer Harlow Giles Unger about John Qunicy Adams.