The provided text presents an in-depth historical analysis of civil rights in the United States, focusing on African American experiences from 1870 to 1970. The structure of the text is complex with well-defined sections, a clear timeline, and references to notable historical figures and events, which indicates an academic level of writing. The language used is formal and consistent, although there are some minor grammatical errors, such as missing article usage, which could suggest human authorship. Moreover, the text incorporates specific citations from various historians, showcasing a nuanced understanding of the subject matter that may exceed the present capabilities of AI models, which often lack the depth of analysis or the ability to properly cite sources. The overall coherence and use of evidence may suggest that it is more likely authored by a knowledgeable individual rather than generated by an AI.
Given the complexity, detailed analysis, and nuanced understanding of historical contexts and figures, it is less probable that the provided text was generated by AI. Instead, the writing reflects a human author's intention, likely due to the sophisticated synthesis of historical facts, critical analysis, and use of citations. Therefore, while there are AI features within the text, the likelihood of human authorship remains considerably higher.