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The United States thought that it had solved its problems after assuming independence, but the tension between the northern and southern states only grew due to differences in relation to slavery. The northern and southern states were completely different, and had very different views on almost everything. Although the act of commitment was implemented, this did not solve the problems, as the states were still very independent and created ways to circumvent these rules. All this tension led to the Civil War.
The Civil Rights Movement convinced scholars that some social movements do not result from a unification of psychological needs but need to be explained by a broader socio-economical perspective. In such an explanation, the needs of the individuals do not have to coincide with the needs of the group as a whole.