How did the Central Asian steppe impact Asian history in general and Chinese history in particular?

In general, essay should be 600-900 words long (2-3 pages), contain at least three or four references to the readings, have a clear argument and a discernible beginning, middle and end. Citations are not necessary; just refer to the author and/or text you are drawing upon. Do not quote directly from any article, assigned or otherwise.
All the following sources must be used:

http://www.essential-humanities.net/world-history/steppe/
http://www.chaos.umd.edu/history/imperial.html
http://www.chaos.umd.edu/history/imperial2.html#restoration
http://www.chaos.umd.edu/history/ancient1.html
http://www.indianoceanhistory.org/files/Classical%20Era.pdf
http://www.indianoceanhistory.org/files/Medieval%20Era.pdf
http://afe.easia.columbia.edu/mongols/
http://www.britishmuseum.org/explore/themes/trade/the_silk_road.aspx
http://www.bioanth.org/PacificPrehistory/pdf/terrell-et-al2001.pdf

Essay Question:
How did the Central Asian steppe impact Asian history in general and Chinese history in particular?


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