The population of the entire world in 5000 B.C., according to the National Population Council, was 5 million.
The population of the American colonies in 1610 was 350.
The black population of Houston Texas is greater than the total population of the entire state of Alaska.
Roughly a quarter of the world's people live in China.
Roughly 40 percent of the population of the underdeveloped world is under fifteen years old.
It is estimated by the national population council that 74 billion human beings have been born and died in the last 500,000 years.
In the tenth century A.D. There was not one city in Europe with a population over 400,000.
In 1790 only 5 percent of the American population lived in cities.
Every year one out of five American families changes its place of residence.