Answer:
Voting rights for African Americans
Explanation:
The march was conducted in 1965, when protesters conducted a protest walk from Selma, Alabama to Montgomery. The purpose of the march is to protest racial injustice in united states and demanded the government to allow the african Americans to exercise their right to be involved in the democracy. (at that time they were already allowed to vote, but the government still created some barriers that prevent them to do it)
This march lead to the creation of the voting rights act 1965, which designed specifically to address those voting barriers.
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The correct answer is social exclusion
Social Exclusion designates a process of removal and deprivation of certain individuals or social groups in different areas of the structure of society.
It is a condition inherent in contemporary capitalism, that is, this social problem was driven by the structure of this economic and political system.
Thus, people who have this social condition suffer from various prejudices. They are marginalized by society and prevented from freely exercising their rights as citizens.
Socially excluded people are usually ethnic, cultural and religious minorities. As examples, we have blacks, Indians, the elderly, the poor, homosexuals, drug addicts, unemployed people, people with disabilities, among others.
Note that these people or social groups suffer a lot of prejudice. This directly affects aspects of life, and in many cases creates another problem called "social isolation".