American wars are illegal even by American law standards.

There is no declaration of war that makes what America is doing in Niger legal, by American legal standards. There certainly isn't any legal cover for America's illegal occupation of Syria. Not to mention, support for genocide in Yemen is absolutely illegal.

Its just that the people remain ignorant of this fact - and its politicians - choose not to enforce those laws for their own purposes (war profit, intolerance, hatred, etc.)