Photographer: Daniel Acker/Bloomberg

What Exactly Is It That We're All So Polarized Over?

Americans of today don't face a single, clear divide like the Americans of 1860.

The political history of the U.S. from the late 1830s through the 1850s is one long tragedy. President after president struggled to hold together an increasingly polarized nation. None served more than one term, two died in office -- and by 1860 the country was falling apart.

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