What were some of the contributions from frederick the great?

Which events are correlated but do not necessarily have a causal relationship?

Which action by the us war department angered chief red cloud to the point that he refused to sign the treaty of fort laramie ? a) the killing of buffalo by the united states troops b) the appointment of troops to the powder river basin c) the burning of parts of the powder river basin d) the murder of chief red cloud’s wife

Need answers to all questions for this paper