What does the term Manifest Destiny imply?

Manifest Destiny. the belief or doctrine, held chiefly in the middle and latter part of the 19th century, that it was the destiny of the u. s. to expand its territory over the whole of north america and to extend and enhance its political, social and economic influences

The term Manifest Destiny refers to the idea in the late 1700s and early-to-mid 1800s in the United States that the US was "destined" to reach from the Atlantic to the Pacific oceans. Settlers used this a reason to displace and slaughter thousands of Natives on their way to the Pacific.