Following the civil war, many southern states implemented literacy tests, an eight-box law, and the grandfather clause in an effort to prevent blacks from doing which of the following? (a)voting in elections (b)gaining u. s. citizenship (c)joining white labor unions (d)owning property or their own businesses

(B)gaining U.S. citizenship.I think is the best anwser.

the three-fifths compromise was proposed by james wilson and roger sherman, who were both delegates for the constitutional convention of 1787. however, the three-fifth compromise has its roots further back in history, dating back to the continental congress in 1783. the compromise was a result of the apportionment of taxes being related to land values.

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abraham lincoln  (february 12, 1809  – april 15, 1865) was an american statesman, politician, and lawyer who served as the 16th  president of the united states  from 1861 until  his assassination  in april 1865. lincoln led the nation through the  american civil war, its bloodiest war and its greatest moral, constitutional, and political crisis.[2][3]  he preserved the  union,  abolished slavery, strengthened the  federal government, and modernized  the u.s. economy.