. >> there's a long time after george henry white leaves congress where there are no african-american to serve in either the house or senate. that has everything to do with the jim crow laws that go on the books in the south and the way that changes over time during those decades is that there's a critical thing going on in the south, where african-americans begin to leave the south and move northward as part of a multi-decade movement that would later be called the great migration. that begins, depending on which historian you talk to, 1890's and runs through world war ii. it picks at momentum around world war i as there is a need in the north to fill industrial jobs that have been occupied by men who have gone off to fight in the war. you see tens of thousands african-american -- tens of thousands of african americans moving out of the rural south, additive agricultural jobs, to industrial jobs in chicago, st. york, andtsburgh, new the african american population in the city's increases and the african-americans in those cities are gradually recruited by the political parties. depri