Is living in close quarters was the only reason disease spread in Europe.​

Prior to the presence of europeans on the continent, the slave trade in africa a) did not exist in any form. b) was limited to internal trade only. c) included the trans-saharan and indian ocean slave trade. d) was rarely needed due to the lack of an agricultural economy.

In the period from 1860 to 1890, which experience was shared by most native americans living in western states?

The answer because i don’t know it someone