In 1947, Prime Minister of Afghanistan, Mohammed Daoud Khan, had rejected the Durrand Line, which was accepted as international border by successive Afghan governments for over a half a century. The British Raj also came to an end and the British Crown colony of India was partitioned into the new nations of India and Pakistan, the latter which inherited the Durrand Line as its frontier with Afghanistan. Daoud Khan's irredentist foreign policy to reunite the Pashtun homeland caused much tension with Pakistan, a nation that allied itself with the United States. Daoud Khan's policy was fueled by his desire to unite his divided country. Daoud Khan started emulating policies of Emir Abdur Rahman Khan and for that he needed a popular cause (a Pashtun homeland) to unite the Afghan people divided along the tribal lines and a modern, well equipped Afghan army which would be used to surpass anyone who would oppose the Afghan government. Daoud Khan's policy to annex Pashtun areas of Pakistan had also angered Non-Pashtun population of Afghanistan. Similarly, Pashtun population in Pakistan were also not interested in having their areas being annexed by Afghanistan. In 1951, the United States's State Department urged Afghanistan to drop its claim against Pakistan and accept the Durrand Line.