By 1840, how much cotton did the United States produce annually as a result of changes in technology?
Aabout 3,000 bales
Babout 300,000 bales
Cabout 1.3 million bales
Dabout 1.3 billion bales.
Aabout 3,000 bales
Babout 300,000 bales
Cabout 1.3 million bales
Dabout 1.3 billion bales.