• The 14 large domesticated animals could only be found in North Africa, Asia, Europe, and South America.
• The llama could only be found in South America.
• North America, Sub-Saharan Africa, and Australia have no tamable beasts of burden.    

This is all I remember taking notes of because I forgot my notebook. My question was answered though. The reason the native Americans were not very advanced is because there were no animals of burden in North America at the time. Horses, cattle, and goats were not brought until later which probably kick-started the American Colonists.