Check this 6 minute video clip about "One of the Most Advanced Ancient Civilizations on Earth".
Check this 8 minute clip titled "The Olmecs: Black Civilizations of America from Prehistoric Times".
Check this 8 minute clip titled "The Olmecs of Mesoamerica".
We are on the unit about the Americas which is Chapters 11 and 12.
To see the Internet version of Chapter 11, lessons 1, 2 and 3, click on the icon to the left to take you to that web site.