Question

what was one major outcome of the north winning in the US Civil War

Answer 1

The confederate attacked Fort Sumter, when the union soldiers ran out of ammo the eventually had to surrender.

Answer 2

Slavery was abolished throughout the entire nation.

However, the Emancipation Proclamation was declared during the war. However, the Confederate States of America was considered its own country, so it had no effect until the war was over.