States often use reservations to modify their treaty obligations. Prior research demonstrates why states enter reservations and why states object to reservations, but little work explains why states withdraw them. We argue that states withdraw reservations in response to international social pressure. Using novel data on reservations and reservation withdrawals for the nine core international human rights treaties, our analyses reveal two factors that compel states to withdraw reservations: (1) pressure from peer states and (2) pressure from human rights treaty bodies conducting periodic reviews. While previous work emphasizes domestic factors, our research shows that the international community encourages states to withdraw reservations and strengthen their commitments to human rights and international law.

In 1976 the UK ratified the ICCPR with a reservation that prevented individuals without the right to ‘enter and remain’ in the UK from invoking Article 12(4) and ‘other provisions’ of the covenant. Upon Hong Kong's reunification with China, the ICCPR ‘as applied to Hong Kong’ in accordance with the UK's ratification was constitutionally guaranteed. It will be argued that the legislation implementing the ICCPR does not reflect the constitutional guarantee ‘as applied to Hong Kong’ because it amounts to a blanket exclusion of all ICCPR rights in immigration matters, impermissibly going beyond the UK's reservation.