Late last week, the world was captivated by footage of tens of thousands of migrants crossing from Morocco into the Spanish territory of Ceuta—more than 60,000 over the course of roughly 24 hours. Spain has since rushed troops and resources to Ceuta to push migrants back across the border. Today, Zineb Riboua explains what’s really behind the migrant surge—and why fierce domestic divisions between the Moroccan government and radical Islamist actors made it all but inevitable. —The EditorsTo understand why tens of thousands of Moroccan migrants just stormed into the Spanish territory of Ceuta, it is not enough to understand European open-border policies—you must also understand the dynamics in their country of origin. Morocco is a semi-constitutional monarchy led by a king, who governs alongside an elected parliament where Islamist, secular, and nationalist parties compete for political influence.