Answer: C) Warfare with others.
Explanation:
The earliest known people of Oklahoma were Osage, Quapaq, Caddo Witchita, Waco Tawakony, Comanche, Apache and several other tribes. When the white men started to encroach upon their land it led to constant warfare. Which was a major cause for the decline in their population. Another factor was that they were uprooted to make Oklahoma available for White men after 1865.
Whites were superior to blacks
They had a lot of cotton that was needed to make clotheing. Although I don't remember much of the industrial revolution, I know this. it's best you listen to other answers as well to put the pieces together.
