150 years on, James Naughtie examines the relevance of the Gettysburg Address for today.
Global figures celebrate Dr Martin Luther King's legacy by reading "I Have a Dream".
Sir Malcolm Rifkind and others discuss international surveillance.
Jonathan Freedland looks at the history of leaks from the military establishment.
Does the Declaration of Independence guarantee the protection of personal property?
Melvyn Bragg and guests discuss Abraham Lincoln's Gettysburg Address, 1863.
Combative, provocative and engaging debate, presented by Michael Buerk.