Achievements of American Indians?

The American Indian civilization has invented a lot of interesting, and in some places even useful. This is not to say that the Indian tribes were so backward than any others. It was the Mayan American Indians who began to cultivate cocoa trees, from which chocolate was later obtained. In addition to cocoa, they domesticated and cultivated a large number of plants, such as corn or beans. In addition, the Indians are the pioneers of tobacco.