Using the information at the time the war wasnt illegal. The US tries to involve the UN to make it seem legitimate, but we proved that we do what we want no matter what.
The problem with the UN is that is doesnt really have any power, it doesnt have its own military, it relies on member nations( mostly the US) it hasnt accomplished what it is supposed to do, just look at the genocides in rawanda and other african nations, the UN was supposed to stop that sort of stuff, but instead they all get rich from oil for food.
Im not against a group of nations working together, just not in the form of the UN(which is a barely improved version of the league of nations)
In certain states in the US(such as NY) premptive self defense is legal, if i feel somebody poses an imminent threat to me i am allowed to strike first to defend myself...now this is hard to prove in court and is rarely a good defense but it is on the books.
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