Historians believe that the invention of the cotton gin had which of the following effects?
a.
an increasing number of people moving to the cities
b.
a decreasing number of privately owned farms
c.
the expansion of slavery in the south
d.
the migration of african americans to the north

C - the expansion of slavery in the South

Explanation:

With the invention of the cotton gin, more workers (slaves) were needed to work the fields to increase the amount made from the cash crop.

it should be c, women were allowed to vote in all states because federal law supersedes state law.

"states can make their own laws, as long as they don't contradict what the federal law states. the states do not have the authority to pass a law that negates a federal law." -google

answer; /// the correct answer is (a) burned the city;