It might have been that once the Earth started to warm, some animals weren't able to adapt. Or possibly because new needs had to be met, so they found new animals to domesticate that could help with the new situation.
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why did the europeans look down upon the indians? That was your question, now I am here to give you an answer. Your answer is this: They did not, I do not know where you saw this but this is very very very incorrect!! Many people have different opinions and beliefs but there is no correct answer so please, please do not believe where ever you are reading this false info. Its not correct!! Stop! Thank you, bye! :)
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The completion in 1825 of the Erie Canal below connecting lake Erie with the Hudson River,was an event of major importance in Michigan history because it greatly facilitated the transportation of passengers and freight between the eastern seaboard and Michigan ports.
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So they can get alot of cash and spend it all on gold mining stuff. www.goldrush.com