Immediately after Pakistan emerged, Afghanistan put forward a demand for the creation of an independent “Pashtunistan,” meaning “land of the Pashtuns.” The idea was that Pakistan should allow the Pashtuns in the northwestern part of their country to—if they so chose—secede and become an independent state. Though the size of the envisioned Pashtunistan differed over time, Afghanistan’s proposals frequently encompassed about half of West Pakistan, including areas dominated by Baluch majorities.
Though these demands were framed as supportive of Pashtun national independence, they were in fact irredentist. If Pashtunistan came to exist, it probably wouldn’t remain independent for long, as it would be a fragile and essentially defenseless state. The historical linkage between the Pashtuns and Afghanistan would likely dictate a merger of Pashtunistan into Afghanistan. And even if Pakistan never acceded to the Pashtunistan demand, Afghanistan had essentially staked its claim to that area if the Pakistani state were to fail. The incorporation of Pashtunistan and the majority Baluch areas into Afghanistan would, in turn, solve one of Afghanistan’s major strategic weaknesses—the fact that it’s a landlocked state. The Baluch majority areas would give Afghanistan access to the Arabian Sea.
From a legal perspective, Afghanistan’s claim about the illegitimacy of its border with Pakistan was rather weak. Though Afghanistan claimed that the border had been drawn under duress, it had in fact confirmed the demarcation of this international frontier on multiple occasions, including in agreements concluded in 1905, 1919, 1921, and 1930. But the weakness
of Afghanistan’s legal case took a backseat to the historical connection it felt to the Pashtun areas, and the strategic benefits it would derive from expanding its territory.