@1dyv not sure how you meant this, but the statement we "have all the resources we'd ever need in the USA" is patently wrong.
If you're talking people and knowledge, what happens if some new revolutionary technology is discovered in another country, but because of white replacement fear we don't exchange knowledge and become slow to adopt it, falling behind the rest of the world? Look at how many businesses in America are owned or run by immigrants.
If you're talking resources as in anything we need or use to support people, that's the most indefensible statement ever. For batteries alone, the USA lacks production capacity for 14 of the required ingredients. Imagine life without batteries. No phones, no push-button/turn-key engine starts.
We most definitely do not have everything we need. Even if we did, we'd still be trading with the world because that's how the planet works.