1) South Dakota's largest industry is agriculture, producing crops like wheat, corn, alfalfa, and soybeans as well as livestock.
2) In the late 19th century, bison numbers declined drastically from hunting but have since rebounded to around 250,000, now protected by law.
3) The Sioux Indian Chiefs fought to maintain control of lands in western South Dakota and Montana but the government broke treaties and forced Native Americans from their lands.