US taxes all income you earn anywhere in the world. It’s not that bad in practice, as first $100k or something earned abroad is exempt, and there are anti double taxation treaties with many countries, but overall, if you’re a US citizen abroad, you might owe US taxes.
I'd guess that most people living in Argentina are not, in fact, US citizens. If an Argentinian did a contract for an American company while living in Argentina, I'd expect them pay Argentinian rather than US income tax on that
Does that apply in the context of this thread? Presumably the person hired in Argentina is a Argentinian national, not a US citizen living in Argentina.
Incorrect. It taxes all income anywhere jn the world for US citizens and green card holders, _regardless_ of where they reside or the source of their income.