A map from 1916 of North America, Central America, Greenland, and the Caribbean to Puerto Rico showing the population distribution at the time. The map is color-coded to show areas where the population density ranges from under 1...

A base map of Asia from 1921 showing the general population distribution of the region at the time. "The climate of southeastern Asia is so warm and moist that food plants grow there in abundance. Nearly half the people of the world live...

A base map from 1921 of North America, Central America, and the Caribbean showing the general population distribution in Alaska, Greenland, Dominion of Canada, United States, Mexico, and Central America at the time. People are most...

A map from 1907 of the United States showing the distribution of the population in 1870. The map is keyed to show areas of population with densities ranging from under 2 inhabitants per square mile to 90 and over inhabitants per square...

A map of the central and eastern United States in 1860 showing the distribution of the population in the region at the time. The map shows State lines, the frontier line in 1860, and is keyed to show the areas of population density...

A map of the United States showing the population distribution in 1850. The map is coded to show population densities ranging from under 2 inhabitants per square mile to over 90 inhabitants per square mile. The map illustrates the...

A map from 1901 of the United States showing the population distribution at the time. The map is keyed to show areas of population densities ranging from sparse to very dense. This map is part of a classroom map study illustrating how,...

A map from 1911 of North America, Central America, Greenland, and the Caribbean to Puerto Rico showing the population distribution at the time. The map is color-coded to show population densities from under 2 persons per square mile to...

A map from 1898 showing the population distribution of North America, Central America, and Caribbean to Puerto Rico. The map shows areas of sparse to heavily populated concentrations at the time. "Many thousands of white men from western...

A population map of United States and territories in 1820 showing the distribution of the European-American population at the time and the general tribal lands of the Native Americans east of the Mississippi River. The map shows the...

A population map of United States and territories in 1820 showing the distribution of the European-American population at the time and the general tribal lands of the Native Americans east of the Mississippi River. The map shows the...

A population map of United States and territories in 1830 showing the distribution of the European-American population at the time and the general tribal lands of the Native Americans east of the Mississippi River. The map shows the...

A map of the United States showing the distribution of the population in 1880. The map is keyed to show areas of population with densities ranging from under 2 inhabitants per square mile to 90 and over inhabitants per square mile.

A map of the original thirteen States in 1790 showing State lines, territories northwest and south of the Ohio River, British and Spanish possessions, and the distribution of the European-American population east of the Mississippi River...

A map of the original thirteen States in 1790 showing the distribution of the European-American population at the time and the general tribal lands of the Native Americans east of the Mississippi River. The map shows the State lines,...

A map of the central and eastern United States in 1840 showing the distribution of the population in the region at the time. The map shows State lines, the frontier line in 1840, and is keyed to show the areas of population density...

A map from 1912 of the United States, subtitled "Distribution of Population and Railways in 1900" showing the increase in population and expansion of the railroad network since 1850. The map is color-coded to show population densities...

A map from 1912 of the United States, subtitled "Distribution of Population and Railways in 1850." The map is color-coded to show population densities ranging from areas with fewer than 2 inhabitants per square mile to areas of 90 or...

A map from 1910 showing the political boundaries and the distribution of population density of Asia at the time. This map uses gradated shading to shows areas of population densities ranging from under 2 inhabitants per square mile to...

A map from 1910 of North America, Central America, Greenland and the Caribbean showing population density distribution in the region at the time. The map is coded to show areas of population densities ranging from less than 1 inhabitant...

A map from 1910 of the United States showing the distribution of the population in 1900. The map is keyed to show areas of population with densities ranging from under 2 inhabitants per square mile to 90 and over inhabitants per square...

A map of the United States showing the distribution of the population in 1910. The map is keyed to show areas of population with densities ranging from under 2 inhabitants per square mile to 90 and over inhabitants per square mile. The...

A map of the eastern United States in 1790 showing the western extent of the territories to the Mississippi, and the distribution of European-American population at the time. The map is keyed to show areas of population densities ranging...

A 1916 map showing the distribution of population in Europe as inhabitants per square mile.