What connection does the author draw between slavery and the lowell system textile mills ?

answer; /// i believe that the correct answer is (d)the huang he river valley;

the effect of the ming leaders banning ships with more than two masts was that there was no further construction of ships masts, because there was a surplus. ming emperors disallowed foreign exploration

a because i tried to vote with just my college id and the answer was no

literally just took the test, got a 100%. i couldn't be bothered to type it all out, so i just took pictures.

should be in order from q 1 to 35.