"Native Americans" usually only refers to Native Americans in the United States; Alaska Natives, like the Iñupiat, Aleut, and Yupik peoples are sometimes included, but more often named individually.
In most contexts, the phrase "Native Americans" specifically pertains to those living in the United States; however, Alaska Natives, including groups such as the Iñupiat, Aleut, and Yupik, may be mentioned collectively or individually within this broader category.