What is associated with: 1900 dorothy lived in the midst of the great kansas prairies?

Based on the clue '19 years before commanding the aef in wwi he charg...', what is the answer? What is associated with: 1900 its slang for an informer? What is associated with: 1900 a naval officer tries to live down the cowardly act of abandoning a ship he thought was s… What is associated with: 1900 british troops invade orange free state during this conflict? What is associated with: 1900s coat or 1970s car? What is associated with: 1901 baskerville hall? What is associated with: 1901 leon czolgosz? What is associated with: 1901 up from slavery?