Majority of the native populations in the period before behaved uniquely even before the European contact interacted with the natural environment in North America.
Most of the American Indians lived in organized societies with political structures, moral codes and religious beliefs. They all adapted to the particular environments in which they lived and the idea of private land ownership was foreign as their land was held communally and worked collectively.
The European presence in the North America spurred countless changes in the environment and negatively affecting native animals as well as people.
This is evident as the Europeans carried a hidden enemy to the Indians: new diseases. The Native peoples of America had no immunity to the diseases that European explorers and colonists brought with them. Diseases such as smallpox, influenza, measles, and even chicken pox proved deadly to American Indians.
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