The United States of America’s population has been continually rising from the moment it gained independence centuries ago. Since 1790, a national census has been conducted at the start of each decade (the population for this year 3,929,000). The census numbers were gathered through various means – this even includes door to door polling. But the US’ Census Bureau Has so far not yet counted every single person. Aside from information about the general population the Census Bureau also gathers data that range from the ethnicity concentrations of the country to the income of each household and even individual housing information.
The growth in the US population could be partly credited to what is described as the positive difference between immigration and emigration, also known as net international migration). Another factor for population growth is the birth rate being larger than the death rate, which is considered a natural increase or growth in the population. In fact, more than half of the factors identified as contributors to the rise in the population of the US can be attributed to natural factors.
The Census Bureau not only has a record of the United States' population from the past Census surveys, it also makes projections for the future population numbers. In fact, there are even figures for middle estimates of the future population of the country up to 2100. Of course these are highly speculative figures because any kind of forecasts cannot foretell significant factors that may happen in the future that could affect population numbers on a wide scale. Given this, with a present population of 299,862,000 for 2010, it is speculated that by 2100, the population will reach 570,954,000.