For one, I wouldn't have put big ol' India in the middle of East and West Pakistan... and left Kashmir up for grabs with all of that surrounding the area. Don't get me started on that partition; in my view, Pakistan should never have formed, but that's a whole other topic.
I wouldn't have given the same property to two peoples who cannot or WILL not live together in peace... take a look around. The division of land in the ME and in South Asia has led to a huge proportion of our problems world wide. Don't tell me the West didn't realize what they were doing when they put enemies in the same zip code, and when they put enemies in countries dividing common people.
In addition to the false wars we've created, is it a wonder the world is in such disarray?