What piece of legislation to expand the middle class?

a. the servicemen's readjustment act
b. the voting rights act
c. the national defense and education act

The Civil Rights Act of 1964 was a piece of legislation that helped to expand the middle class. It outlawed discrimination based on race, gender, color, religion, etc.

d

explanation:

the communist manifesto is an 1848 political pamphlet by the german near the end of the manifesto, the authors call for a "forcible overthrow of all existing social conditions",  ..