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I feel like u already did it
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The Black Codes sometimes called Black Laws, where laws governing the conduct of African Americans. The best known of them was 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. Although Black Codes existed before the Civil War and many Northern states had them, it was the Southern U.S. states that codified such laws in everyday practice. In 1832, James Kent wrote that "in most of the United States, there is a distinction in respect to political privileges, between free white persons and free colored persons of African blood; and in no part of the country do the latter, in point of fact, participate equally with the whites, in the exercise of civil and political rights."
Hope this helps!
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It would clearly be better to use systematic observation with more naturally occurring offending.
One type which lends itself to this approach is shoplifting.
Three well-known observational studies have been carried out in which random samples
of shoppers were followed through stores by security officers and store detectives.
There is no timeline so i'm just gonna slide in here for some points thx ^-^