What's the term for American expansion across the west?

by 403redditor

You know, when 13 Colonies existed and started grabbing lands further west? What's the term or name for that?

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We used the phrase "Manifest Destiny" to justify our westward expansion and subjugation of the natives. It didn't directly refer to our movement in that regard, but it became a sort of shorthand for the whole idea. Is that what you're looking for?