Final answer:
The Third Wave of immigration to the United States was mainly comprised of Hispanics, particularly Mexicans.
Step-by-step explanation:
The immigrant wave to the United States that was comprised mainly of Hispanics, particularly Mexicans, is the Third Wave. By the 2000s, about half of U.S. immigration came from the rest of the Americas, especially Mexico. This is supported by the fact that one-third of Hispanics are immigrants to the United States, and most undocumented workers to the United States are Hispanic.