The grand canal was built to connect
a)the yellow sea and the east china sea.
b)the yangtze river and the east china sea.
c)the huang he river and the yangtze river.
d)the huang he river and the yellow sea

b: the establishment clause  

b: socialism  

while it was true that the cotton gin reduced the labor of removing seeds, it did not reduce the need for slaves to grow and pick the cotton.

explanation:

before eli whitney's invention of the cotton gin, picking and cleaning cotton was a slow, labor-intensive job. workers, usually slaves, had to pick the seeds from the cotton fibers by hand. this invention made it possible to grow large amounts of cotton on big farms and make money.