Name a recognized American Indian tribe in the United States.

The Cherokee is a recognized American Indian tribe in the United States, well-known for its distinct culture, history, and political structure. The Cherokee Nation, primarily located in Oklahoma, is one of the largest tribes in the country and plays a significant role in American Indian affairs. Their contributions to the history of the United States include their involvement in significant events such as the Trail of Tears and the establishment of their own written language by Sequoyah.

In contrast, the Viking, Aztec, and Inca refer to different historical and cultural groups. The Vikings were seafaring Norse explorers from Scandinavia, while the Aztecs and Incas were ancient civilizations based in Mesoamerica and South America, respectively. None of these groups are recognized American Indian tribes within the context of the United States.