Why have blacks been most numerous in the south

In the past, the southern region of the United States parcipitated in slave trade. This leads to the former slaves staying in the South with their descendants which leads to a higher population of blacks in the south.

Explanation:

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.