Before revision: Manifest destiny was a phrase that represented the belief in the 19th-century United States that American settlers were destined to expand westward across North America, and that this belief was both obvious ("manifest") and certain ("destiny").
After revision: and inevitableManifest destiny was a phrase that represented the belief in the 19th-century United States that American settlers were destined to expand westward across North America, and that this belief was both obvious ("manifest") and certain ("destiny").