sentences:  The predominantly white community is noted for its history of racism, which includes two race riots in the early 20th century and an influx of white supremacist activity in the late 20th and early 21st centuries.Native Americans were the earliest inhabitants of the area, probably beginning with cliff dwellers who lived in caves in the bluffs along the rivers.In later times, the Osage, a branch of the Sioux, was the main tribe in the Ozarks, and one of their larger villages is thought to have been to the east of the present site of Harrison.