JEFFREY BROWN:

Some perspective now on history and today.

Hrach Gregorian is an adjunct professor at American University and president of the Institute of World Affairs, a nonprofit organization that focuses on conflict analysis and post-conflict peace-building. And Soner Cagaptay is the director of the Turkish Research Program at the Washington Institute for Near East Policy. He's the author of the recent book "The Rise of Turkey: The Twenty-First Century's First Muslim Power."

Welcome to both of you.

Let me start with you, Hrach Gregorian.

1915, I just want to fill in a little bit of the history. The Ottoman Empire is collapsing. What led specifically to the killing of so many Armenians?