During reconstruction, many northerners came to the south to the area rebuild, to ensure the former slaves were protected, and to ensure the development of strong republican party. these northerners were often referred to as

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Spread knowledge of agriculture to humans around the worldprevented human development of language and other ideaswas not a part of human life until only the last 2,000 yearsencouraged most human groups to maintain a nomadic life

True,  spain conquered the incas and the aztecs for their gold and silver.