How was the Constitution significant in helping African Americans to gain civil rights?

A) Reconstruction-era Presidents passed executive orders guaranteeing equal rights.
B) African Americans challenged laws and customs that violated their constitutional rights.
C) The NAACP wanted to establish an entirely new Constitution to better protect minority rights.
D) President Truman encouraged the public to ignore the Constitution in terms of minority rights.

It's A because past presidents had their say in the constitution and the constitution has rvolved over time granting everyone equal rights.

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",  ..

the industrial revolution pushed the world into modern industrialization. it changed the course of history profoundly. it caused rapid urbanization and pushed cities and countries into development. the industrial revolution began in great britain with a series with new inventions which led to the creation of machines and mass production.

this caused the country to gain wealth and money and become an international superpower. it improved transportation and manufacturing inside the country, pushed people to live in urban areas and britain to become the most powerful nation in the world for a while.