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United States birth rate (births per 1000 population). [26] The United States Census Bureau defines the demographic birth boom as between 1946 and 1964 [ 27 ] (red). In the years after WWII, the United States, as well as a number of other industrialized countries, experienced an unexpected sudden birth rate jump.
Population pyramid of the United States in 2023. In recent decades, the fertility rate of the United States has declined below replacement level, prompting projections of an aging population and workforce, [1] [2] as is already happening elsewhere in the developed world and some developing countries. [3]
The net reproduction rate (R 0) is the number of surviving daughters per woman and an important indicator of the population's reproductive rate. If R 0 is one, the population replaces itself and would stay without any migration and emigration at a stable level. If the R 0 is less than one, the reproductive performance of the population is below ...
China's population is projected to crash 55% by the turn of the next century. Italy's will sink 41%, and Brazil's will drop 23%. Top economies face ‘population collapse’ as fertility rates ...
Under federal law, the Immigration and Nationality Act of 1965, [41] the number of first-generation immigrants living in the United States has increased, [42] from 9.6 million in 1970 to about 38 million in 2007. [43] Around a million people legally immigrated to the United States per year in the 1990s, up from 250,000 per year in the 1950s. [44]
As the United States has grown in area and population, new states have been formed out of U.S. territories or the division of existing states. The population figures provided here reflect modern state boundaries. Shaded areas of the tables indicate census years when a territory or the part of another state had not yet been admitted as a new state.
This is a list of colonial and pre-Federal U.S. historical population, as estimated by the U.S. Census Bureau based upon historical records and scholarship. [1] The counts are for total population, including persons who were enslaved, but generally excluding Native Americans.
The United Nations Population Division defines sub-replacement fertility as any rate below approximately 2.1 children born per woman of childbearing age, but the threshold can be as high as 3.4 in some developing countries because of higher mortality rates. [1]