Yemen is in the midst of civil war, a brutal conflict that has caused the world’s worst humanitarian crisis according to the United Nations. By some estimates, 75 percent of the people there are in need of humanitarian assistance. Millions have been forced to flee, and more are at risk of starvation. Abby Maxman, president of Oxfam America, recently returned from a trip to Yemen. She visited camps for displaced people, and has returned to the U.S. determined to help.