Friedman, India, and Pakistan

Today Thomas L. Friedman tells us that Muslims could use diversity now to become democratic. I posted his piece above.
I had friends in college from India and Pakistan. I was a little confused then, because as Friedman writes, they are basically the same people, but I was to learn then that they just had a war in 1971. Why are they different?
Friedman believes it has to do with diversity. Pakistanis have a problem with that as we can see with the current Musharraf's shenanigans.