The answer to your question is Celebrates the Exodus, the freedom from slavery of the Children of Israel from ancient Egypt that followed the Ten Plagues.
The 13th, 14th, and 15th Amendments, known collectively as the Civil War Amendments, were designed to ensure equality for recently emancipated slaves. The 13th Amendment banned slavery and all involuntary servitude, except in the case of punishment for a crime.The 14th Amendment to the U.S. Constitution, ratified in 1868, granted citizenship to all persons born or naturalized in the United States—including former slaves—and guaranteed all citizens “equal protection of the laws.”The 15th Amendment to the Constitution granted African American men the right to vote by declaring that the "right of citizens of the United States to vote shall not be denied or abridged by the United States or by any state on account of race, color, or previous condition of servitude."
Last one: Native Americans believed nature was sacred while white settlers believed nature was a resource.
Many industrial cities such as Detroit have a history of dominance of employment sector by industries.These industries paid relatively high wages for low-skilled jobs and gave a sense of security ensured by large unions. But at the same time these safe conditions discouraged workers from starting their own businesses or continuing education.
Hence, Declining basic employment sector in industrial cities have left them with a lack of job opportunities for a poorly qualified workforce pushing many families below the poverty line.