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"The Great Migration of the World War I era was only the beginning of a process with profound demographic, occupational, and political implications for African Americans. A new "southern exodus" began following a sharp but relatively short-lived economic depression after World War I ended, as the demand for labor again intensified. . . . The 1920s migration soon exceeded the level of the wartime migration of southern blacks to the urban North. The new migrants came for the same reasons as their wartime predecessors. . . . White southerners could never again convincingly maintain that African Americans were content with their lot; too many southern blacks had already spoken with their feet."— Eric Arnesen, historian, Black Protest and the Great Migration, 2003The excerpt above best serves as evidence of which of the following?

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