'Great Migration' refers to mass migrations of African-American population in the years 1915-1970. Around 6 and a half million blacks have moved from Deep South to the industrial regions of the North and later, Western US. It has been the biggest internal migration in the history of the US. The first, pioneering wave of Great Migration that happened in the years 1915-1929 which included 1.5 million people, have defined and set the main destination of these movements. It triggered the whole range of fundamental social changes among African-American community beginning the process of its urbanization, proletariatization, and dispersal of the so-called 'black problem' along with the issues of racism and discrimination to the whole of US.
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