The works progress administration stimulated manufacturing by
a. providing people with retirement income.
b. giving workers the right to organize and strike.
c. giving workers increased purchasing power.
d. encouraging artistic creativity.

Generally speaking, the Works Progress Administration stimulated manufacturing by "giving workers increased purchasing power," since this was a way for many people to find employment, which gave them money to spend on items and services. 

Answer on edge is:

C) giving workers increased purchasing power.

Armistead Burt wrote the black codes.

Explanation:

Armistead Burt, a moderate constitutional lawyer from South Carolina, helped draft his state's Black Codes. Ironically, Burt was eventually appointed to the judiciary by Republican administrations later in the 1860s.