President Trump’s triumphant visit to the Middle East is likely to be remembered as the occasion that changed not just United States foreign policy but potentially the balance of power in the region. During the past eight years, a string of failed states have littered the region and a truculent Iran has extended its imperial tentacles from the Persian Gulf to the Mediterranean. As the Middle East went through another one of its vulnerable transitions, former President Barack Obama stood aside and occasionally lectured the Arab states to share the region with Iran. In a short time, Trump acknowledged that the Islamic Republic remains the primary cause of disorder in the region and that the U.S. would now stand by its allies.