Cahokia Indian Mounds
I recently learned that there once was an urban complex of Native Americans in the United States that dates back to the 9th century. I had heard of the Mayans, was somewhat familiar with the Aztec civilization that built pyramids in Mexico, and had even visited Teotihuacan when I was in high school. Over the years, I have visited Anasazi ruins and other Native American sites in the southwest U.S. And of course I learned about the decimation of the native tribes across the continent, due to diseases like smallpox, brought by the explorers and settlers. I am aware of...