Why did the mongols employ foreigners rather than chinese in high government offices?

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.

This document provides the framework for the united states government. it consists of three main parts: the preamble, seven articles, and 27 amendments.

List a few examples of city-states that practiced oligarchy in ancient greece