How does the United States count its population?

The total number of residents in the United States is obtained by integrating a series of monthly estimates after the latest census, which changes every minute, and the speed of change in the same month (calculated by calendar) is constant. According to the National Center for Health Statistics, the Centers for Disease Control uses the latest census data, plus the number of births, minus the number of deaths, including the number of net immigrants and the number of people living abroad because of military operations, to get monthly estimates, calculate this month's estimates through past monthly estimates, and then calculate the average number of people per minute. For example, in February of 20 13, it is estimated that one person was born every 8 seconds, one person died every 12 seconds, and one person immigrated to the United States every 36 seconds (net number); Add one person every 15 second.

In other words, the key to population statistics lies in two kinds of data: census data and vital statistics data.

The U.S. census was completed by the Census Bureau. According to the Constitution (American Constitution? Article 1, article 2), once every ten years, for the purpose of making statistics and surveys on all the population in the United States; The theoretical investigation date is 1 April.