The easiest ways for this to happen are obviously Bush winning the nomination in 1980 over Ronald Reagan or John Hinckley Jr. successfully assassinating Reagan. Either way, how do you think a Bush 1981-1989 Presidency would unfold? Bush was considered more of a centrist, so I'd expect less...
1980s
cold war
george h.w. bush
john hinckley jr.
reaganomics
ronald reagan
unitedstatespresidentialelectionof 1980
unitedstatespresidentialelectionof1984unitedstatespresidentialelectionof 1988
walter mondale