The Hypothetical Balkanization of the United States

This week on Listening to America with Clay Jenkinson, Clay's conversation with his regular guest Professor Lindsay Chervinsky about Ten Historical Counterfactuals. Historians are warned never to indulge in what if history, but we cannot help it, it just such fun. What if the British had won the Revolutionary War? What if Alexander Hamilton had become the President of the United States? What if Jefferson had never owned an enslaved person?  What if the South had won the Civil War? What if John F. Kennedy had not been assassinated on November 22, 1963? What if Adolf Hitler had gotten an atomic bomb for use at Moscow or Stalingrad? If some of the pivotal moments in world history had gone the other way, how might things be different?