Why was Clark's victory at Fort Sackville important to westward expansion?

Clark's victory at Fort Sackville was important because the British had realized that in order to attack the Americans in Kentucky, fort Sackville will prove to be an important war base.

Explanation:

British had soon realized the importance of the fort Sackville. The location of the fort was imperative because if the British wanted to defeat America and its allies, it needs a proper air base.

British would be able to easily defeat and destroy the American settlement found in Kentucky.