Making an argument for overhauling the nation's immigration system Friday to a crowd of conservative activists, former Florida Gov. Jeb Bush claimed immigrants were "more fertile" and thus a great benefit to American society. His remark appeared to be an inarticulate reference to immigrants' fertility rates, which data show are higher than native-born Americans. "Immigrants create far more businesses than native-born Americans over the last 20 years. Immigrants are more fertile, and they love families, and they have more intact families, and they bring a younger population. Immigrants create an engine of economic prosperity,"