What was the purpose of the Twenty-fifth Amendment and how was it important less than a decade after it was passed?

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.

Why do many scientists suppose the land bridge theory of migration?

Policy proposing equal trade opportunities to trade in china