What are some ways that the ongoing war affected american society?

The Civil War began during medieval medicine's last gasp and ended at the dawn of modern medicine. Each side entered the war with puny squads of physicians trained by textbook, if at all. Four years later, legions of field-tested doctors, well-versed in anatomy, anesthesia and surgical practice, were poised to make great medical leaps.

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Use the formula: (n-2)×180, where n is the number of sides(18-2)×180= 28800, now this is the full exterior angle of 18-gon so you divide it by 18.28800÷18=160