The entire concept of Terra Nullus originated from the idea that a land was “uninhabited” if it didn’t have western control. I understand that the Faulkland Islands didn’t have an indigenous population, but I’d argue that of all parties involved, the Argentinians have a better claim since it was their territory that they administered after gaining independence from the Spanish.

Whether it be Guam, Hawaii, Algeria, Gaza, and the West Bank, etc., it is immoral in my opinion for a nation to lay claim to land external to their original borders. By that rationale, the moon now belongs to the US because they got there first.