Pakistan inherited the 1893 agreement and the subsequent 1919 Treaty of Rawalpindi after the partition from the British India in 1947. There has never been a formal agreement or ratification between Islamabad and Kabul. Pakistan believes, and international convention under uti possidetis juris supports, the position that it should not require an agreement to set the boundary; courts in several countries around the world and the Vienna Convention have universally upheld via "uti possidetis juris" that binding bilateral agreements are "passed down" to successor states. Thus, a unilateral declaration by one party has no effect; boundary changes must be made bilaterally.