What role did religion play in the exploration of north america

The viceroy of spain asked that coronado's expadition be cristian and apostolic and not a buchery,what does that mean and did cornado follow his orders

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.

Which major change took place in nigeria in 1999?