|The splendor and sophistication of ancient China's walled civilization (Linc060/flickr)|
|The USA is only a small part of America|
When Columbus arrived in the Caribbean in 1492, unknown to him he was on islands located between two huge land masses now known as North America and South America. It was teaming with huge civilizations rivaling any in the world at the time. There were thousands of smaller First Nations and tribes. According to recent estimates, the population may have exceeded 100 million people from Alaska and Greenland in the north, to the southern tip of South America. In proto-Canada, most people lived along the coast or along major rivers.