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An international conflict taking place in northern Europe from 1618 to 1648. The war was fought between Catholics and Protestants and also drew in the national armies of France, Sweden, Spain, Denmark, and the Habsburg dynasty that ruled the Holy Roman Empire.
I’m not sure on politics, however that time period is when society developed the middle class and started to have “rules” of society, like you aren’t supposed to wear this and don’t act this way, etc.
The Yalu River also known by Koreans as the Amrok River or Amnok River. It is a river on the border between North Korea and China.
Commorde Perry had a fleet that was technologically superior