As far as Pakistan is concerned, its position on Durand Line has been consistent. Under the international law principle uti possidetis juris, Pakistan retains the same borders as its predecessor state held and does not need to conclude another treaty with Afghanistan for this purpose. The Vienna Convention on Succession of States also upholds uti possidetis juris by declaring that bilateral agreements are handed down to successor states.
Pakistan’s stance is supported by all countries of the world, including USA. In 1949, two years after independence of Pakistan, the British House of Commons officially reconfirmed their position declaring that the Durand Line was the legal border between Afghanistan and Pakistan. The following year in 1950, the Queen of England also recognized that the Durand Line was Pakistan’s international western border according to international law.