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 turning point in the American Revolution because it was a decisive victory for the American Patriots over the Loyalists and British forces. This victory not only bolstered Patriot morale but also weakened Loyalist support in the region, contributing to subsequent successes for the American forces.