Check out this study that was just released by US2010 by John R. Logan and Richard N. Turner at Brown University. It is titled "Hispanics in the United States: Not Only Mexicans". Find the full report at:
http://s4.brown.edu/us2010/Data/Report/report03202013.pdf. Learn more about this report at:
http://inamerica.blogs.cnn.com/2013/03/20/study-hispanics-show-increasing-cultural-economic-and-social-diversity/?hpt=hp_c1.