"Diaspora" means the dispersion of a people with an ancestral origin from a common homeland. Historically, African diaspora people were at odds with the question of what it meant to be black. Two of the main black intellectual voices into the questions of Black Identity were Booker T Washington and W.E.B. Dobois.These black thinkers explored and contextualized the important issues of the diaspora : sociological, anthropological, and philosophical debates on issues of race, gender, and belonging.
However, they sharply disagreed on their views. Du Bois's advocated Pan-Africanism, the belief that all people of African descent had common interests and therefore should all work together for their freedom in civil rights. He was in favor of black nationalism by refusing to accept legal segregation. He also criticized that Washington's popularity in the white community hindered other strategies towards racial equality. Booker T Washington, on the other hand, suggested that African Americans should accept segregation and the denial of the right to vote. According to Washington, Black Identity was to be achieved by working towards progress in business and technical education.
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The Marshall Plan, first proposed in 1947 and enacted in 1948, was a U.S. program established to attract European countries into aligning with the United States and halt the spread of communism.
Some of the pull factor codes were things like the Homestead acts which were a series of acts on land allocation. For example, if you went westwards, the country would give you a huge piece of land which would become fully yours after five years of successful agricultural business.
Not sure if this is the answer your looking for but one could be They reacted to it harshly, and were suspicious of all immigrants that came to American from a communist country