In the court case "brown vs board of education", thurgood marshall and other colored people from the NAACP fought to desegregate schools. the winning of this case helped to end segregation and gave colored people the confidence to bring other cases to court.
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The social Contract by Jean Jacques Rousseau, the publication of Common Sense by John Locke, and the concept of equiality among men are elements that inspired many latin american leaders. These revolutionary ideas were popular in most european universities where many latin american leaders, such as San Martin de los Andes, Mariano Martinez, and Manuel Belgrano, studied and tried to apply back in their country during the 1900s.
World War II occurred as a result of several factors, including (but not limited to) Nazi Germany's aggressive military and industrial expansion, as well as Japan's foreign policy in Asia and Italian Facism.