Final answer:
The cause of Red Cloud’s War was a combination of broken promises by the government and the construction of a trail through Sioux hunting grounds.
Step-by-step explanation:
The cause of Red Cloud’s War was a combination of broken promises by the government and the construction of a trail through Sioux hunting grounds.
Initially, the government made promises in a treaty with the Sioux but failed to uphold them. This led to frustration and anger among the Sioux. Additionally, the government built a trail through Sioux hunting grounds, encroaching on their territory and resources. These actions by the government ultimately sparked conflict between the Sioux and US soldiers.