Final answer:
White Americans are the dominant racial group in the United States, and the term "white" is used to categorize people of European ancestry. However, this category can also include people from Northern Africa and Southwest Asia. The concept of Whiteness and White racial identity has changed throughout U.S. history, with certain ethnicities not always considered White.
Step-by-step explanation:
White Americans are the dominant racial group in the United States, with 76.3% of U.S. adults identifying as White alone according to the U.S. Census Bureau. The term "white" usually identifies a group of people who refer to themselves as "Americans" without any prefix. However, it is important to note that the category of "white" is also used to include people from Northern Africa and Southwest Asia. The concept of Whiteness and White racial identity has evolved throughout U.S. history, with certain ethnicities not originally considered White later becoming included in the White identity over time.