I believe that the answer to the question provided above is that <span> establishing smaller ethnic communities within larger communities gives more chance for people to know each other more but this might lead to the </span>conflict between groups.
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Okay, well a plow is used for farming. Basically the Sumerian plow is like a modern day tractor. If you have ever heard the term, "to plow the fields", you would know and immediately think of a tractor.
I believe its 1869
fun fact on the inventions timeline coca-cola was intruduced 8 May 1886 :P
B) There were more animals capable of being domesticated in America than in Europe, Asia, and Africa?
