America is at a turning point in which the events of 9/11 are shifting from memory to history. In his book, "The Only Plane in the Sky," author Garrett Graff compiles a comprehensive oral history timeline of Sept. 11, 2001, told via brief diary-like accounts.
The UN peacekeeping mission in Rwanda seemed straightforward at first. But as the mass killings began, the UN ordered its blue helmeted troops to evacuate foreigners — but not intervene to save the Tutsis from slaughter.
This month, Yazidis mark five years since ISIS overran northwestern Iraq, murdering an estimated 5,000 Yazidi men and boys who refused to convert to Islam, and enslaving some 7,000 women and girls, including some as young as nine.