The Slave Trade

From Slate - 

See an animation of the slave trade in two minutes.  Each dot represents a ship.  It is utterly fascinating.  Unfortunately I couldn't figure out how to post it, but you can find it here:

http://www.slate.com/articles/life/the_history_of_american_slavery/2015/06/animated_interactive_of_the_history_of_the_atlantic_slave_trade.html

The Atlantic Slave Trade in Two Minutes

315 years. 20,528 voyages. Millions of lives.

This map represents the flow of slaves from Africa to the Americas.  It is from slavevoyages.org.