Final answer:
Asian and Hispanic populations are projected to have the largest growth in the U.S., influenced by increasing diversity within the general population and workforce.
Step-by-step explanation:
The racial groups expected to have the largest growth in population in the United States are Asian and Hispanic. This projection is based on the data from the U.S. Census Bureau which indicates that the proportion of U.S. citizens who are of Hispanic background is predicted to rise substantially, and there is also expected growth within the Asian population. Moreover, the U.S. racial and ethnic diversity is increasing not just in the general population but in the workforce as well.