I think it is complex. (Sorry if it is wrong)
The Sioux didn't want to give up their land, but the US wanted to make houses and live there. They had to use interpreters because most didn't speak each other's languages. The Sioux signed treaties, either willing, or forced to. Some treaties were unfair and favored the US.
(This is a bit favoring the Native Americans, I will admit)
In most states, other leaders in the executive branch are also directly elected, including the lieutenant governor, the attorney general, the secretary of state, and auditors and commissioners.
It is the oldest known civilization in the Americas and one of the five sites where civilization originated independently and indigenously in the ancient world, flourishing between the 30th and 18th centuries BC. It pre-dated the Mesoamerican Olmec civilization by nearly two millennia.
