below replacement level fertility in 1972 census birth rates (4 million births/291 million people) (4 million births/291 million people) 2.0 percent 4 million babies America 4 million babies SUSPS http://www.susps.org/overview/birthrates.html http://www.susps.org/overview/birthrates.html http://www.susps.org/overview/birthrates.html census birth rates http://www.susps.org/overview/birthrates.html America 2.0 percent roughly 1.1% population growth rate census birth rates census birth rates census birth rates http://www.susps.org/overview/birthrates.html will http://www.susps.org/overview/birthrates.html roughly 1.1% population growth rate census birth rates America http://www.susps.org/overview/birthrates.html http://www.susps.org/overview/birthrates.html http://www.susps.org/overview/birthrates.html Population Momentum America http://www.susps.org/overview/birthrates.html http://www.susps.org/overview/birthrates.html