Which city was transformed by mansa musa into an architectural showplace and a great center of learning known as the "pearl of africa"?

a. cairo
b. khartoum
c. timbuktu
d. dakar
b/

The Pearl of Africa and the city of Mansa Musa is Timbuktu! (answer c)

Timbuktu is best known as a historical town, although it´s still inhabited - by 50 000 people. It had its golden times in 14th and 15th centuries when it was the capital of teh Mali Empire.

Opposition to the nra came to a head in 1935, when the conservative supreme court declared the agency unconstitutional, claiming the nra gave the executive branch regulatory powers that belonged exclusively to congress. this decision began a series of court decisions that overturned key elements of the new deal.