The correct answer to this open question is the following.
Although you did not attach any context to the above-mentioned quotation or further references, we are going to assume that you are referring to Solidarity, the social moment in Poland that turned into a worker union that opposed the Communist government.
I have to say that a don't agree with the statement ‘Solidarity died as quickly as it started, having achieved nothing."
I consider that the Solidarity movement in Poland accomplished many things. Indeed, the strike of August 14, 1980, changed the political scenario in Eastern Europe.
The leader of the movement was Lech Walesa. Years later he won the presidential election of Poland. His victory and Vacláv Havel’s victory to become President of Czechoslovakia signified the transformation of Eastern Europe from dominance by the Soviet Union to new democracies.
So what started as a union movement in Communist time in Poland, ended up being a political party that got to power when Lech Walesa became the President of Poland in December 1990.
 
        
             
        
        
        
African Americans settled in the slum and ghettos of the Northern side changing the demographics of the cities.
Explanation:
Places like Harlem in New York and Compton in California where there were very low income areas settled by predominantly black people in otherwise bludgeoning economies where they became slums is a characteristic of this migration. 
As the north did not discriminate as much against the black population they moved over to their side and then they had not enough resources to live their lives well so they lived in the slums they had made.
These slums would remain the usually economically backward areas of the US for long. 
 
        
             
        
        
        
Answer:
selling products for cash
 
        
             
        
        
        
Correct answer (as highlighted in the choices shown):
<h2>Representation in the two legislative houses.</h2>
Explanation:
The Great Compromise was a measure decided during the United States Constitutional Convention in 1787.  It resolved a dispute between small population states and large population states.  The large population states wanted representation in Congress to be based on a state's population size. The smaller states feared this would lead to unchecked dominance by the big states; they wanted all states to receive the same amount of representation. 
The Great Compromise created a bicameral (two-chamber) legislature, with different rules for representation in each chamber. Representation in the House of Representatives would be based on population.  In the Senate, all states would have the same amount of representation, by two Senators.