Which event most directly contributed to the end of us involvement in vietnam

How were returning african-american soldiers treated in american cities in 1919–1920?

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.

How did the byzantine culture influence russia?