Smallpox decimates tribes - survivors join together (12 ene 1837 año – 24 nov 1838 año)
Descripción:
 A smallpox epidemic destroys the Numakiki Indians in North Dakota. The one in 1838 is so severe that only 130 out of 10,000 people survive. The Numakiki join with other survivors among the Sahnish (Arikara) and Minitari (Hidatsa) peoples. 
Añadido al timeline:
fecha:
12 ene 1837 año
24 nov 1838 año
 ~ 1 years and 10 months