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 significant because it marked a decisive victory for the American Patriot forces over loyalist troops in the South. This victory not only elevated the morale of the Patriot cause but also helped to diminish loyalist strength in the region, ultimately contributing to the broader efforts of the Revolution.