Westward Expansion

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1.
croprotation
2.
fertilizer
3.
irrigation
4.
barbedwire
5.
unionpacific
6.
centralpacific
7.
chinese
8.
german
9.
irish
10.
cowboys
11.
homesteadact
12.
homesteader
13.
buffalo
14.
branding
15.
manifestdestiny
16.
steelplow
17.
gold
18.
railroadtowns
19.
woundedknee
20.
cattledrive