A. Cotton gin
The South was based on agriculture, which means lots of cotton was produced. The cotton gin is a machine which made this much easier.
It seems that you have forgotten the given choices for this question but anyway, the correct answer would be ninety-six percent (96%). Of adults born before 1940, the percentage that got married is 96%. But during 1980 and 1981, the rate of divorce were the highest on record. Hope this answer helps.
They are important because they just are
The main result of the Supreme Court ruling in Gibbons v. Ogden was that "<span>The Court defined interstate commerce and declared federal law supreme over state law," since the ruling was that the power of Congress to regulate interstate commerce applied to navigation as well. </span>
