It's makes sense because at the slavery was illegal time slavery was a wide spread issue it was legal and Zen was abolished and you can't punish someone for something that was legal but during the Nuremberg more trials Germany lost the war in history is written by winners and they were atrocities committed and war camps were blatantly stated after the peace treaty in France in 1918 stated that any form of forced labor or POW camps shall feed clothes and protect its prisoners
Bleeding Kansas refers to the border war between Pro-Slavery and Anti-Slavery citizens. It took place on the Kansas/Missouri border.
The invention of the compass allowed for new maritime trade routes
