How did society and american culture react to the civil war?

The primary effects were that the union was preserved and that slavery was abolished. There has also been lingering resentment by those who think that the Confederacy had the right to secede and that the North was overly violent in preventing that secession. The whole history of the civil rights movement, the Ku Klux Klan, and many other social phenomena have been influenced strongly by the Civil War

People were shocked & some could've believe what was happening . Many just wanted a happy life instead of getting killed .

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