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alternatehistory.com
It's really startling to think how dramatically Ronald Reagan's choosing George H. W. Bush as his VP effected history. Had he not been the sitting VP, George Bush probably doesn't become President in 1988 and there's a very different history then for a number of different reasons and his son George W. probably doesn't go on to become the Governor of Texas or eventually the President meaning we have a completely different administration when 911 happens(assuming it still happens).
The question is who might Reagan have picked and how would history have gone from there.