"History really doesn't follow a straight line. It zigs and zags," Obama says in the film. But the arc is toward "a less violent, more empathetic" world.
The Senate Intelligence Committee will hear from Obama officials this week as part of its probe into Russian interference in the U.S. elections.
Power was visiting West Africa to meet Boko Haram victims.
Samantha Power, U.S. ambassador to the United Nations, has protested the move.
The young boy ran into the road and was struck by an armored jeep in the northern city of Mokolo.
There is little debate among scholars that the events of 1915 constitute genocide. Politicians skirt the term for other reasons.
The United States voted against the measure.
The United States told the United Nations Security Council on Wednesday there needs to be greater international pressure on Russia to abide by a ceasefire in Ukraine, as Russia denied it was a threat to its neighbor.