Which of the following allowed northern cities to trade more goods?

The Panama Canal.

The National Road.

Toll roads.

The Erie Canals.

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.

answer:

it caused mass african migration, african populations to grow, african empires to topple, and racism against slaves to emerge.

i dont have that book