Name one American Indian tribe in the United States.

The correct answer is Cherokee because the Cherokee are a recognized American Indian tribe in the United States with a rich cultural history and significant historical presence in regions such as the southeastern United States. They are one of the largest tribes in the U.S. today and have their own government, language, and traditions.

The other options refer to groups that do not meet the criteria of being American Indian tribes in the contemporary context. The Aztec and Inca are ancient civilizations that existed in what is now Mexico and Peru, respectively, but they are not recognized tribes within the modern framework of U.S. tribes. The Viking refers to a group of seafaring Norse people, primarily from Scandinavia, and not an American Indian tribe. This context helps underscore the specific identification of the Cherokee tribe within the United States.