Syrians have for a century welcomed over a million refugees from Armenia, Palestine, Iraq and other countries around the region. Now, thanks to a multiyear civil war, they are on track to become the source of the world’s largest refugee population in a matter of months. As Jordan, Lebanon, Turkey and other neighbors strive to accommodate the millions of Syrians, the risk of allowing Syrians to become dependent on emergency aid and forming a “lost generation” remains.