the nation. The adoption of the 13th
             Amendment to the Constitution completed abolition in 1865. Slavery included a major
             role in the economic development of the United States. Slaves helped clear the
             wilderness and build important canals, railroads, and roads. The cotton picked by slaves
             became the nation's most valuable export, which paid for a major share of U.S. imports.
             But, the Klu Klux Klan used the blacks and still use them as their scapegoats. The
             following is from a KKK supporter: "the Klu Klux Klan came into
             ...