What Permitted Bands of Original Americans to Make Their Way

Multiple Choice

What permitted bands of original Americans to make their way southward and eastward across the Americas, eventually reaching the far tip of South America thousands of years before the first Europeans arrived in the Americas?  

A) the onset of an Ice Age in the Americas 10,000 years ago.
B) the same climatic warming in the Americas that melted the ice and drowned the bridge to Eurasia about 10,000 years ago
C) the introduction of horses and covered wagons into the Americas 10,000 years ago.
D) the development of cartography by these original Americans
E) none of these