(1) per capita birth rate (B/N) for US = 0.014 and per capita death rate (D/N) for US = 0.008 (Click here to return to the section of notes that sent you to this question.)
(2) Crude birth rate for US = approximately 14 per 1000 persons
(calculated from N of approximately 304 million persons, and approximately 4.3 million births [= (4,256,000 / 304,500,000) X 1,000])
Crude death rate for US = 8 per 1000 persons
(calculated from N of approximately 304 million persons, and approximately 2.4 million deaths, as above for crude birth rate)
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(3) r = b-d therefore r =(0.014 - 0.008) = 0.006 for the US in 2008 (Click here to return to the section of notes that sent you to this question.)
(4) G = (b-d)*N = rN = 0.006 * 304 million = 1,824,000 persons = current population growth rate (net gain) for US per year (Click here to return to the section of notes that sent you to this question.)
(5) No, we are growing at about 1.8 million persons per year INDEPENDENT of immigration. This population growth rate of approximately 1.8 million persons per year is about twice the net immigration into the US per year (which was estimated in the early 2000's to be about 897,000 persons per year) (Click here to return to the section of notes that sent you to this question.)
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This page is maintained by Patricia Muir at Oregon State University. You can address questions or comments to me at (muirp@science.oregonstate.edu) . Page last updated Oct 21, 2008.