If a state is not recognized by other states then it is isolated culturally, economically, educationally, and militarily (to name a few). There would be no trade for products requiring the state to be self-sufficient. Food crops would need to be grown in great quantities to feed the entire population. Manufacturing would be required to clothe, house, service everyone. This magnitude of isolation would prove detrimental to the populace.
The incorrect answer is B. the cotton gin decreased the need for slave labor in the deep south. In fact, it did quite the opposite, it made slave labor a bigger need, since there was so much buisness.
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