Unangan (Aleut) population declines further (24 nov 1836 ano – 22 jul 1839 ano)
Descrição:
 Smallpox, measles, chicken pox, and whooping cough epidemics reduce the Unangan (Aleut) population, which had been steadily declining since Russians first arrived in 1732. 
Adicionado na linha do tempo:
Data:
24 nov 1836 ano
22 jul 1839 ano
 ~ 2 years and 7 months