system
Given the following post, respond as if you're commenting on Reddit:
human
[Fallout] What if the NCR/Caesars Legion were introduced to the capital wasteland?
gpt
Probably steam roll everyone in the Wasteland save the Enclave.  Remember, the NCR has fought to at minimum a stale mate both the Brotherhood and the Enclave already, and they've grown since then.

If we assume the Lone Wanderer ended the Enclave before they arrived (reasonable considering it'd be after the whole New Vegas incident), then the strongest force in the wastes would be, what, maybe 100 guys in barely functioning power armor?  Who are fighting Super Mutants, protecting the innocent, and having to deal with their own rebels.  Yeah the NCR would just roll over them.

Caesar's Legion is different.  They've never really gone against a big player and won.  Sure they fought the NCR but the fact that they're on one side of the dam and it's definitely NCR says they lost.  So if you transplanted the entire Legion in the Wasteland, maybe they take it over completely.  Maybe.  Possibly.  Not really, they're pretty shit.  Football gear and knives?  The muties would knock 'em out before the Brotherhood got a chance.