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By June 2015, the U.S. is home to more than 320 million inhabitants. The US population is diverse in ethnic and national lines. By June 2015, 77% of population are White people, 13.2% are African Americans, 5.5% are Asians, 1.25% are native Americans, less than 1% are native Hawaiian and other Pacific Islander population, and 2.5% are two or more races. Population pyramid for races has different forms. For White Americans, African Americans and native Americans the structure looks like a pyramid with a stationary type of reproduction, where the shares of children and old age groups are almost balanced. For Asians the pyramid has a regressive type of reproduction, which is characterized by a relatively high share of elderly and old people and a modest share of children. And for two or more races population the pyramid is progressive or expanding, that is among people belonging to two or more races there is a high proportion of children and a low proportion of the older generation.

Source: United States National Population Estimates, 2015

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