It is very urbanized, with 81% residing in cities and suburbs as of 2014 (the worldwide urban rate is 54%). California and Texas are the most populous states, as the mean center of U.S. population has consistently shifted westward and southward. New York City is the most populous city in the United States.
https://en.wikipedia.org/wiki/Demographics_of_the_United_States
The Census Bureau projects a U.S. population of 417 million in 2060, which is a 38% increase from 2007 (301.3 million). However, the United Nations projects a U.S. population of 402 million in 2050, an increase of 32% from 2007.
https://en.wikipedia.org/wiki/Demographics_of_the_United_States
Urban Population: Population living in areas classified as urban according to the criteria used by each country. Country's Share of World Pop: Total population in the country as a percentage of total World Population as of July 1 of the year indicated.
http://www.worldometers.info/world-population/population-by-country/
The American population almost quadrupled during the 20th century—at a growth rate of about 1.3% a year—from about 76 million in 1900 to 281 million in 2000. It reached the 200 million mark in 1968, and the 300 million mark on October 17, 2006.
https://en.wikipedia.org/wiki/Demographics_of_the_United_States
In 1900, when the U.S. population was 76 million, there were 66.8 million Whites in the United States, representing 88% of the total population, 8.8 million African Americans, with about 90% of them still living in Southern states, and slightly more than 500,000 Hispanics.
https://en.wikipedia.org/wiki/Demographics_of_the_United_States
The total fertility rate in the United States estimated for 2014 is 1.86 children per woman, which is below the replacement fertility rate of approximately 2.1. Compared to other Western countries, in 2012, U.S. fertility rate was lower than that of France (2.01), Australia (1.93) and the United Kingdom (1.92).
https://en.wikipedia.org/wiki/Demographics_of_the_United_States
World Population: Total World Population as of July 1 of the year indicated. Global Rank: Position held by the country in the list of all countries worldwide ranked by population (from the highest population to the lowest population) as of July 1 of the year indicated.
http://www.worldometers.info/world-population/population-by-country/
The total population in United States was last recorded at 318.9 million people in 2014 from 76.1 million in 1900, changing 319 percent during the last 50 years. 1Y 5Y 10Y MAX. Forecast Export Data API Access.
http://www.tradingeconomics.com/united-states/population
Million. Yearly. The population of the United States represents 4.52 percent of the world´s total population which arguably means that one person in every 22 people on the planet is a resident of United States.
http://www.tradingeconomics.com/united-states/population
Definitions. Population: Overall total population (both sexes and all ages) in the country as of July 1 2014, as estimated by the United Nations, Department of Economic and Social Affairs, Population Division. World Population Prospects: The 2012 Revision. For forecasted years, the U.N. medium-fertility variant is used.
http://www.worldometers.info/world-population/population-by-country/
us world population percentage
The percentage of the United States world population is 4.52 percent. The United States population is 4.52 percentage.