United States conducted its first census in 1790.
Marshals of US judicial districts visited every home,
asking for the name of the head of the family and the
number of persons in each household. The reported population
was 3.9 million.
In the late 1990s, the fastest-growing
states were concentrated in the South and West.
By order of the US Constitution, a census
must be conducted every 10 years. This has
traditionally been done in the years ending in 0.
Every two years, the Census
Bureau conducts a sampling focused on a particular
area, such as transportation or housing, to identify trends.
The results of the US Census determine each
states number of members in the House