The US vs Dakota war in 1862 was an armed conflict between the United States and many bands of Dakota (known as Sioux Indians) .
The violation of some treaty by the US caused an increased of Dokota's hunger and a war of four years.
During war the Dakotas made attacks wich resulted in several settlers and immigrant deaths. The US goverment with the desire of revenge, captured hundreds of Dakota men an families, then, with military tribunal quickly tried the men, sentencing 303 to death for their crimes. President Lincoln would later commute the sentence of 264 of them. The mass hanging of 38 Dakota men was in Minnesota; it was the largest mass execution in United States history.
Some problems faced were fighting against communism and keeping their democratic governments
they were also in huge amounts of debt
They were both used to control the population of a certain demographic in the area and/or racially cleanse these areas
Ratifying amendments is a an example of a reserved power that is exclusive to the state governments. In the Article Five, which is part of the Constitution, shows about ratifying of new amendments and is referred to as "reserved powers of the states".
The answer would be choice C.