Beyond abolishing slavery in the United States, the Civil war was a pivotal event in American history for a number of reasons. One major importance of the war was that the Union retained its territorial integrity and the South was not able to secede from the Union or defeat the Northern forces. Also as a result of the war the Northern States were able to assert political dominance and a degree or retribution through the reconstruction efforts.
I have to say B. The rest were concepts made in Greece, by Greek philosophers, politicians, or mathematicians. An example for an advancement in math is the Pythagorean Theorem. I hope this helps!
