The correct response is: "The win was a great boost to Patriot morale and the Loyalists of the Carolina Back Country were broken as a military force."
The Battle of King's Mountain, fought on October 7, 1780, was a significant victory for the American Patriots. It not only bolstered morale among the Patriot forces but also marked a decisive defeat for Loyalist forces in the area, weakening their presence and influence in the backcountry of the Carolinas. This victory contributed to the shift in momentum in the Southern campaign of the American Revolution.