What was the aspect of American culture in the late 19th century was a major cause of the plexus of social problems that W. E.B Du bois refers to in the study of the negro problems

dont kniw hope this hepl you

continental currency was denominated in dollars from $​1⁄6 to $80, including many odd denominations in between.

it made them more prductive and efficent but with the change of polcies less and les got into the navy