Why was the spoils system created?

Which piece of legislation granted african americans the right to vote

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 constitution of 1917 try to resolve some of the problems that started the mexican revolution