There is a common impression that the US, a key promoter of the multilateral order, increasingly abandons its underpinning institutions thereby eroding its very order. While scholarly interest in the relationship between international institutions and hegemonic powers has celebrated revivals at different historical turning points, we still lack systematic accounts of instances where hegemonic powers rescinded their support for international institutions. This paper starts out to conceptualize hegemonic withdrawal and to assess instances where the most powerful state terminates its participation in or commitment to international institutions. In my original ExitUS Dataset, I compiled information about more than 160 instances where the US withdrew its support from international agreements or organizations since 1945. The results offer important insights into the dynamics of hegemonic withdrawal and pave the way for future research into its drivers and consequences. My findings suggest that, first, hegemonic withdrawal is more common than often assumed. Second, hegemonic withdrawal is not confined to the recent past, phases of relative decline, or unilateralist leaders. Third, hegemonic withdrawal does not affect all institutions equally but varies across institutions with different properties. Finally, the trajectories of international institutions after hegemonic withdrawal are not uniform but some institutions decay while others are robust. The results thus also underline the overall resilience of the current multilateral order.