What was the most important export from the United States by the mid-nineteenth century?

A) tobacco
B) coal
C) timber
D) cotton
E) wheat

Mid-Nineteenth Century

Refers to the period approximately from 1830 to 1870, a time marked by significant historical events including the American Civil War.

Cotton

A soft, fluffy staple fiber that grows in a boll, or protective case, around the seeds of cotton plants of the genus Gossypium.

Export

The act of sending goods or services from one country to be sold or traded in another.