Answer:
The Sioux were promised these annuities in exchange for stopping the violence. When they did not get these annuities then they caused violence again.
Step-by-step explanation:
The US government signed two treaties with the Sioux in exchange for large portions of the Minnesota Territory in 1851. The Treaty said that the land would be given in exchange for compensation in the form of annuity cash payments and trade goods.
The problem was that the organization was poor and corrupt and the resources did not get to the Sioux. Things got worse when Minnesota entered the Union and the government repossessed half of the territory and gave it to white settlers. All of this was the perfect storm for the Sioux uprising in 1862.