One of every eight Americans, and nearly one of every seven Illinoisans, is an immigrant. While immigrants from Latin America make up half of all immigrants in the US, Illinois and metropolitan Chicago, Asian immigrants account for a quarter of all immigrants in the US, in Illinois, and in metro Chicago. In metro Chicago, Polish immigrants make up nearly 10% of all immigrants, ranking only behind Mexico among leading countries of origin. Overall, the immigrant populations of the US and Illinois doubled from 1990 to 2006. In addition, at least 31 million Americans have at least one parent who is foreign-born, including 12.1 million children under 18 and 5.6 million under age 6.