The discovery of what resource, in 1874, in the Black Hills of South Dakota caused the U. S. government to break their treaty with the Dakota Sioux

Gold.

Explanation:

A series of clashes between the Northern Cheyenne, Lakota Sioux and the United States that took place in the years between 1876 and 1877 for the occupation of the Black Hills was known as the Great Sioux War. The discovery of the gold in the Black Hills and the U.S government's desire to establish its control over the Black Hills were the main causes of the war.

alliances in ww1 were different from ww2 because the entente in ww1 made up of serbia,russia,france,britan,japan and italy later america  and all allied in a sort of balance of power and too keep germany,austria-hungary,and the ottomans down. russia allied the serbians in order to exert its influence in the balkans while france allied the russians because france was still in dismay and insulted after the defeat to the germans during the unification of germany and britian allied the belgians after the germans invasion of belgium.in ww2 the alliances were in a preemptive attempt to deter any further wars into happening while germany and italy allied since they were insulted and humiliated after the previous war while also sharing a similar ideology of facsim along with japan which all 3 had a want for world domination and agreed to assist one another in the endevours 

explanation: