The assassination by the United States of Gen. Qassem Soleimani, the head of Iran’s elite Quds Force, near Baghdad’s airport will ignite widespread retaliatory attacks against U.S. targets from Shiites, who form the majority in Iraq. It will activate Iranian-backed militias and insurgents in Lebanon and Syria and throughout the Middle East. The existing mayhem, violence, failed states and war, the result of nearly two decades of U.S. blunders and miscalculations in the region, will become an even wider and more dangerous conflagration. The consequences are ominous. Not only will the U.S. swiftly find itself under siege in Iraq and perhaps driven out of the country—there is only a paltry force of 5,200 U.S. troops in Iraq, all U.S. citizens in Iraq have been told to leave the country “immediately” and the embassy and consular services have been closed—but the situation could also draw us into a war directly with Iran. The American Empire, it seems, will die not with a whimper but a bang.