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What northern industry "opened up the night" as a source of light and provided an equal opportunity to 20,000 African American men?

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Subject- History/Social Studies

Question- What northern industry "opened up the night" as a source of light and provided an equal opportunity to 20,000 African American men?

Answer- The Great Migration was the relocation of more than 6 million African Americans from the rural South to the cities of the North, Midwest and West from about 1916 to 1970. Driven from their homes by unsatisfactory economic opportunities and harsh segregationist laws, many blacks headed north, where they took advantage of the need for industrial workers that arose during the First World War. During the Great Migration, African Americans began to build a new place for themselves in public life, actively confronting racial prejudice as well as economic, political and social challenges to create a black urban culture that would exert enormous influence in the decades to come.By the end of 1919, some 1 million blacks had left the South, usually traveling by train, boat or bus; a smaller number had automobiles or even horse-drawn carts.  In the decade between 1910 and 1920, the black population of major Northern cities grew by large percentages, including New York (66 percent), Chicago (148 percent), Philadelphia (500 percent) and Detroit (611 percent).  Many new arrivals found jobs in factories, slaughterhouses and foundries, where working conditions were arduous and sometimes dangerous. Female migrants had a harder time finding work, spurring heated competition for domestic labor positions.  Aside from competition for employment, there was also competition for living space in increasingly crowded cities. While segregation was not legalized in the North (as it was in the South), racism and prejudice were nonetheless widespread.  After the U.S. Supreme Court declared racially based housing ordinances unconstitutional in 1917, some residential neighborhoods enacted covenants requiring white property owners to agree not to sell to blacks; these would remain legal until the Court struck them down in 1948. Rising rents in segregated areas, plus a resurgence of KKK activity after 1915, worsened black and white relations across the country. The summer of 1919 began the greatest period of interracial strife in U.S. history at that time, including a disturbing wave of race riots.  The most serious was the Chicago Race Riot of 1919; it lasted 13 days and left 38 people dead, 537 injured and 1,000 black families without homes.

. political or economical policy that isolates a country from participating in international relationships. it has been suggested that the united states participates in isolationism because of its lack of involvement in particular wars or alliances.

protected civil liberties and outlawed slavery in the new territories.