Spotlight on: Primary Source Map of the Foreign-Born Population of the United States, 1900 6, 7, 8, 9, 10, 11, 12 According to the 1900 census, the population of the United States was then 76.3 million. Nearly 14 percent of the population—approximately 10.4 million people—was born outside of the United States. Drawn by America’s labor...