What was the result of the invention of the cotton gin? Select one: a. Made cotton farming obsolete. b. Decreased the number of farmers that grew cotton c. An incresase in the demand for land to increase the supply of cotton. d. An increase in demand for more imports

How did the united states respond when north vietnam attacked a us warship and sent troops to south vietnam in the early 1960s? a.the united states declined to assist south vietnam against the north. b.us leaders authorized south vietnam to invade north vietnam. c.the president did not sign the gulf of tonkin resolution. d.congress authorized the president to escalate the conflict.