Algeria is marking 50 years of independence from France today. Algiers wants Paris to apologize for decades of colonial rule - and the deaths of hundreds of thousands of people who fought for independence. But even that - the war's casualty figure - is a subject of disagreement between Algeria and its former colonial master. Why is this? RFI asked historian Matthew Connelly, author of A Diplomatic Revolution: Algeria’s Fight for Independence and the Origins of the Post-Cold War Era.