and the empire of japans agression had nothing to do with the USA, well untill they blindsided us at pearl harbor. the National socialist german workers party had nothing to do with the USA, well untill they elevated Hitler, allied with a country that attacked us and started trying to take over the world that is. Knowing what your enemy is doing and trying to do is extreamly relevent. If you want to stick your head in the sand and ignore things that may directly or indirectly effect the USA, well you do you i guess