The 1870 census was the first-time farmers fell below 50% of American wage earners. Even then, they were still close, at 47.7%. By 1920, farmers were less than one third of the American population. Between 1870 and 1920, 11 million Americans migrated to cities. Learn about the events that spurred this migration and changed our ancestors from rural to urban dwellers and how to reconstruct their stories.