These reference sources are great starting places. Once you discover what contributions each ethnic group is known for, you will be able to search electronic sources better. These books will help you find those contributions. They are all located in the Reference Collection on the first floor of Connelly Library.
Be sure to check the book: The New Americans - which includes chapters on immigration from Cuba and Mexico
Be sure to check the book: The New Americans - which includes chapters on immigration from China and India