The Triangle Trade network between Europe, Africa, South America, and North America moved people and goods between countries so that any time a ship was moving between ports she was carrying something to trade.
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Additional Links:
An overview from PBS about the Triangle Trade.
https://www.pbs.org/wgbh/roadshow/stories/articles/2016/01/11/triangular-trade
An article about the nature of the triangle trade.
https://www.nationalarchives.gov.uk/pathways/blackhistory/africa_caribbean/britain_trade.htm
A visual explanation of the Triangle Trade
https://www.youtube.com/watch?v=WNFiyJZQ-AM