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I think of Pakistan as being more modern and less isolationist than Afghanistan. By modern I mean technologically, education and socially. There seems to be a faction that wants to modernize and become part of the larger world, but another faction that is far more traditional and fundamentalist. There seems to be a struggle between the two.
An example is when Bhutto was elected prime minister (in the late 80s-early 90s?). Electing a woman seemed really progressive in their society. Of course she was kicked out and eventually killed, but she had support during all that time which says something.
I've never really gotten any kind of feeling that Afghanistan has any significant factions pushing for real progress. They seem to be more stuck in time with no escape in sight. I could see Pakistan becoming more of a player in the world, but not Afghanistan any time in the foreseeable future.