Why couldn’t the Europeans use Native Americans as slaves?

The date a source was created is considered part of its historical context intended audience purpose point of view

Why caused john quincy adams to write the monroe doctrine?

How does nafta affect relations between the united states and canada? a. it bans immigration between the two countries. b. it opens the borders between the two countries. c. it raises taxes on trade between the two countries. d. it allows free trade between the two countries.