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Editor’s Note: This story is the third in a series that looks at how and why Iowa voters moved away from Democrats and lined up behind President Donald Trump and other Republicans.

Bonnie Mitchell and Cathy Bailey work side-by-side to archive and research Jackson County’s history in the building that once held a global small engine company.

Mitchell, as the Jackson County Historical Society’s curator and director, is especially quick to rattle off the county's history.

The county is bordered by bluffs overlooking the Mississippi River to the east and cave networks, soaring rocks and hiking trails to the west.

Residents and political leaders have watched local politics become steadily redder

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