Well, here it is from the Census Bureau: Net migration will add one additional person to the population every 36 seconds. [Census Bureau Projects U.S. Population of 305.5 Million on New Year's Day ] From the National Center for Health Statistics, births to immigrant women account for almost one quarter of all U.S. births. Over 4 million births are recorded every year so births to immigrants account for 1 million additional mouths to feed, clothe, house, educate. . .Why do we need this?