Why is Afghanistan not a part of Pakistan?

Afghanistan is an older country. It did not accept the border demarcation represented by the Durand line that the British forced on it. So it had friction with Pakistan since the latter's inception., claiming that its territory extended to the Indus river. read more

If Afghanistan is hostile to Pakistan, its access to the Central Asia could be in jeopardy (Pakistan will not get access to Central Asia: Ghani ). Pakistani military establishment had invested a lot in Afghanistan during the Cold War and wants to reap the dividend by having strategic depth in Afghanistan. read more