hi, i really need help by the end of the day.

an improved type of fencing that enabled farmers tp enclose land on treeless plains

barbed wire??
http://www.google.com/search?q=barbed+wire&rls=com.microsoft:en-us:IE-SearchBox&ie=UTF-8&oe=UTF-8&sourceid=ie7&rlz=1I7SUNA

??

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