The demographics of these states changed markedly from the 1890s through the 1950s, as two waves of the Great Migration led more than 6,500,000 African-Americans to abandon the economically depressed, segregated Deep South in search of better employment opportunities and living conditions, first in Northern and Midwestern industrial cities, and later west to California. One-fifth of Florida's black population had left the state by 1940, for instance. During the last thirty years of the twentieth century into the twenty-first century, scholars have documented a reverse New Great Migration of black people back to southern states, but typically to destinations in the New South, which have the best jobs and developing economies.