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In South Dakota and North Dakota, political pundits, journalists, politicians, academics, and citizens often reduce political questions to an east-west divide. Here we statistically examine whether an east-west divide occurred in presidential voting behavior in the Northern Great Plains over the last century. We found that there were four presidential voting regions in South Dakota and North Dakota. These presidential voting regions reflect the economic, ancestral, and political cultures and landscapes of this area of the Northern Great Plains.