Also, human migration..............the last ice age ended about 10,000 years ago....................i bet negroid Africans walked across the Atlantic ocean to the Americas,,,,,,,,,,,,,,,,,,,,also, i bet that they had already been coming here......................one diaspora after another..........it is what i think anyways.........

The Neolithic Revolution or Neolithic Demographic Transition, sometimes called the Agricultural Revolution, was the wide-scale transition of many human cultures from a lifestyle of hunting and gathering to one of agriculture and settlement, allowing the ability to support an increasingly large population.^[1] Archaeological data indicates that the domestication of various types of plants and animals evolved in separate locations worldwide, starting in the geological epoch of the Holocene^[2] around 12,000 years ago.^[3] It was the world's first historically verifiable revolution in agriculture.

However, the Neolithic Revolution involved far more than the adoption of a limited set of food-producing techniques. During the next millennia it would transform the small and mobile groups of hunter-gatherers that had hitherto dominated human pre-history into sedentary (here meaning non-nomadic) societies based in built-up villages and towns. These societies radically modified their natural environment by means of specialized food-crop cultivation (e.g., irrigation and deforestation) which allowed extensive surplus food production. These developments provided the basis for densely populated settlements, specialization anddivision of labour, trading economies, the development of non-portable art and architecture, centralized administrations and political structures, hierarchical ideologies, depersonalized systems of knowledge (e.g.,writing), and property ownership. The first full-blown manifestation of the entire Neolithic complex is seen in the Middle Eastern Sumerian cities (c. 5,500 BP), whose emergence also inaugurates the end of the prehistoric Neolithic period.^{[citation needed]}

The relationship of the above-mentioned Neolithic characteristics to the onset of agriculture, their sequence of emergence, and empirical relation to each other at various Neolithic sites remains the subject of academic debate, and seems to vary from place to place, rather than being the outcome of universal laws of social evolution.^[4][5]