The election of Donald J. Trump in 2016 has sparked fears of a possible American retrenchment among several allies worldwide and uncertainty over the implications for regional stability as revisionist powers like China and Russia may regard this as an opportunity to consolidate their power in their immediate spheres of influence. Facing two major threats to stability and security within their region, US allies in the Asia-Pacific have been seeking reassurances over the future role of the United States, whose presence over the past seven decades has been a key contributor to stability and prosperity across a region. Despite domestic dynamics that call for an American withdrawal from the world and rhetoric by President Trump that seems to indicate that he envisions such a future for his country, systemic and institutional dynamics are likely to make such a pullout possible, particularly in the Asia-Indo-Pacific, which has displaced Europe and the Middle East as the most important geopolitical and economic center of gravity. Just weeks after his inauguration, the Trump administration has sent signals that suggest continuity rather than a clean break with past US foreign policy, which is likely to bring relief to longstanding American allies across the region.