Which of the following best explains why the Colorado militia launched a campaign against American Indians in the 1860s? A. The American Indians had killed about 200 troops in the bloody Battle of Little Bighorn. B. White settlers believed that the American Indians were planning an uprising in the territory. C. The American Indians had begun to engage in Ghost Dance rituals that frightened settlers. D. White settlers believed that the American Indians would not honor the Treaty of Fort Laramie.