alternatehistory.com

After WWII, American politics shifted from largely being dominated by the midwest and northeast to being dominated by the southwest, with southwesterners Barry Goldwater, Richard Nixon, Ronald Reagan, George H.W. Bush, George W. Bush, and John McCain dominating the GOP and southwesterners/southerners Lyndon Johnson, Jimmy Carter, and Bill Clinton dominating the Democratic Party.

Your challenge is to create an opposite realignment, where instead of the Southwest dominating the 1968-2008 system, the Northwest does. This will likely require a geographic shift towards that region that OTL went to the Southwest, so be creative with how you get that to happen.
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