Why did cotton prices drop in the 1920s, harming Oklahoma farmers?

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.

True or false: abraham lincoln delayed the emancipation proclamation to make sure the border states would stay loyal. *

During world war if an artist published an editorial cartoon criticizing the american entry into the war that artists was guilty of