How has the civil rights movement opened doors for Pres. Barack Obama?, history homework help

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How did the success of the civil rights movement and abolishment of slavery open doors to the election of the first Black American President of the United States, Barack Obama? 

his should be at least 450 words.

Please write your essay in MLA format, and follow the standard five paragraph model. Your essay should have an introduction paragraph, three body paragraphs, and a conclusion paragraph.