Amir Abdur Rahman had bitterly resented the Durand Line and none of his successors relinquished the notion of Pashtun unity even as they cooperated with the British government on other matters. Eventually, the line dividing the Pashtun people became extremely contentious to the governments of both Afghanistan and Pakistan.

Although the issue became most vexing during partition, British policy in the area before 1947 also aggravated the Pashtunistan problem. In 1901 the British had created a new administrative area, the North-West Frontier Province, which they detached from the Punjab. This new province was divided into Settled Districts and Tribal Agencies, with the latter ruled by a British political agent who reported directly to Delhi.

In 1934 Britain extended self-government to the North-West Frontier Province. By this time, the Indian National Congress (Congress Party), which many Muslims saw as a predominately Hindu organization, had expanded its political activities to include the province. The links between the political leaders of the North-West Frontier Province and the Hindu leaders of Congress were such that a majority in the North-West Frontier Province assembly originally voted to go with India in the partition, a decision which probably would have been rejected by the voting majority in the province. In July 1947, the British held a referendum in the Settled Districts of the province offering the population the choice of either joining an independent India or a now-inevitable Pakistan. An estimated 56 percent of the eligible voters participated and over 90 percent elected to join Pakistan. A loya jirgah was held in the Tribal Agencies. Offered a choice between joining India or Pakistan, the tribes declared their preference for the latter.

Although both Afghanistan and Pakistan made conciliatory gestures, the matter remained unresolved. In one of the government's attempts to suppress tribal uprisings in 1949, a Pakistani air force plane bombed a village just across the frontier. In response, the Afghan government called a loya jirgah, which promptly declared that it recognized "neither the imaginary Durand nor any similar line" and that all agreements--from the 1893 Durand agreement onward--pertaining to the issue were void. Irregular forces led by a local Pashtun leader crossed the border in 1950 and 1951 to back Afghan claims. Pakistan's government refused to accept the Afghan assertion that it had no control over these men, and both nations' ambassadors were withdrawn, but were exchanged again a few months later.

The issue of an international boundary through Pashtun areas was of great importance to policymakers in Kabul. Pakistan halted vital transshipments of petroleum to Afghanistan for about three months in 1950, presumably in retaliation for Afghan tribal attacks across the border. At this time, Afghan government interest shifted to offers of aid from the Soviet Union and in July 1950 it signed a major agreement with the Soviet Union.

Data as of 1997