By taking away racial segregation in the military
Jazz, social justice were both big ones
Wounded Knee was in 1890. Specifically it was December 22, 1890.
The bubonic plaque changed the social structure of Europe by this:
Before, the nobles and aristocrats were the 'body' that ran almost everything political. However, after the bubonic plague, this was shifted towards the common people. So the common people basically got more rights.
hope this helps :D
