Answer:
World War 1 had a positive effect on the mindset and attitude of African Americans because it made them to begin insisting more on their civil rights. Their men joined the army and could stand up to the whites to demand for their rights.
Explanation:
Chad Williams, the chairperson of the Department of African and American Studies at Brandeis University (as at 2014), had an interview with Brandeis Now where he revealed the influence of World War 1 in the mindset of African-Americans. According to him, World War 1 afforded black men the opportunity to work with the United States Military. This boosted their confidence and made it more possible for them to demand for their civil rights. The Double V campaign that signified the quest for victory home and abroad was one of such movements aimed at demanding the restoration of the rights of black men. This period also resulted in the migration of a lot African-Americans from the Southern part of the United States to the Northern part that was more accommodating. 
Summarily, World War1had a positive influence on these group of people because  they became more ambitious and demanding of their rights in the society.
 
        
             
        
        
        
D) European social and political reform movements erupted
Explanation:
Almost as soon as the effects of Industrial Revolution became permanent many social and political reform movements sprang up all across Europe looking for greater freedom and rights.
<u>This happened because now the population could see the exploitation within closed quarters of each other and it was easier to mobilize in the cities.</u>
<u>The scholarly response to Industrial Revolution also called for the  dignity of man</u> and safeguard of his rights as he became more of a cog of a machine.
 
        
             
        
        
        
Federalism, separation of power , checks and balances and small and large states <span />
        
             
        
        
        
Because it can be very reliable