The Great Migration

The Great Migration was the movement of 6 million African-Americans out of the rural Southern United States to the urban Northeast, Midwest, and West that occurred between 1916 and 1970.

Some historians differentiate between a first Great Migration (1916–1930), which saw about 1.6 million people move from mostly rural areas to northern industrial cities, and a Second Great Migration (1940–1970), which began after the Great Depression and brought at least 5 million people—including many townspeople with urban skills—to the north and to California and other western states.

Black migration picked up from the start of the new century, with 204,000 leaving in the first decade. The pace accelerated with the outbreak of World War I and continued through the 1920s. By 1930, there were 1.3 million former southerners living in other regions.

As a result approximately 1.4 million black southerners moved north or west in the 1940s, followed by 1.1 million in the 1950s, and another 2.4 million people in the 1960s and early 1970s. By the late 1970s, as deindustrialization and the Rust Belt crisis took hold, the Great Migration came to an end. But, in a reflection of changing economics, as well as the end of Jim Crow laws in the 1960s and improving race relations in the South, in the 1980s and early 1990s, more black Americans were heading South than leaving that region.

African Americans from the rural South to the cities of the North, Midwest and West from about 1916 to 1970. Driven from their homes by unsatisfactory economic opportunities and harsh segregationist laws, many blacks headed north, where they took advantage of the need for industrial workers that first arose during the First World War. During the Great Migration, African Americans began to build a new place for themselves in public life, actively confronting racial prejudice as well as economic, political and social challenges to create a black urban culture that would exert enormous influence in the decades to come.

This information came from the great sites below

wiki Great Migration (African American)
History.com - Great Migration
The Great Migration (1915-1960)
Britannica.com - Great Migration