After World War I broke out in Europe in 1914, there was this great wave and flood of African-American coming from the South pouring into the industrialized urban in the North, Midwest and West. These industrialized urban areas have faced a shortage of industrial laborers. Also, many blacks ended up creating their own cities and culture, like Harlem Renaissance, within big cities, especially Harlem in New York City, white neighborhood, in 1920 housed some 200,000 African Americans. In the 1930s, migration was slowing down when United States experienced Great Depression; however, it was picked up with the coming of WWII.