Answer:
The Black Codes, sometimes called Black Laws, were laws governing the conduct of African Americans (free blacks). The best known of them were passed in 1865 and 1866 by Southern states, after the American Civil War, in order to restrict African Americans' freedom, and to compel them to work for low wages.
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Industrial Revolution made unprecedented advances with agricultural and industrial changes. The following discoveries in technology made it all possible:
1. Agricultural revolution produced raw materials needed for establishing basic industries. New ways, techniques, and systems in agriculture were used;
2. Technology in industries was brought out. High demand and supply on manufacture goods were done with the use of machines.Transportation of raw materials needed by industries was traveled with the help of steam engine trains. The textile industries invented machines to process cotton and produce cloth. Metal industries created metal materials like pins, bullets, guns and machines.
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Answer:
it's the great wall of china
