Chester Z. Arthur is apparently a President of the United States whose term in office takes place somewhere between that of Barack Obama and Bill McNeal.  He is mentioned only as part of a gag in "All the Presidents' Heads". His head is preserved in the Hall of Presidents (at least after Farnsworth and the others have made two trips into the past to interfere with colonial history) beneath James Polk and to the right of John Adams and can be identified easily by his immense brown unibrow.

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