Why did the spanish and portuguese begin using african slaves in their new world colonies in the 1500s?

Describe the relations between the united states and other countries under the articles of confederation. 3-4 sentences

This pie chart shows statistics related to the world's population. a pie chart like this one is most for making predictions about the future. showing how parts make up a whole. presenting amounts over a period of time. comparing information from different sources.

How does the existence of a site like catus hill demonstrate the challenge that archaeologist face when making theories?