The neolithic revolution, was also called the Agricultural revolution, and it was the wide-scale change from hunter-gatherer societies to agricultural societies. This was important because agriculture provides more food, and also more stability to the societies, which in turn allows for a creation and development of civilizations.
I believe the answer is D because that's what the federal system of government means in america.
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When the observance was first declared in 1868 by General John Logan, it was called Decoration Day in reference to a tradition of decorating the graves of those whose lives were lost in the Civil War and its set date was May 30.
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