Answer :
The factor that did not encouraged Westward expansion and settlements in the late 1800s in the west is peace with native Americans (Option D).
Westward expansion was encouraged by variety of factors. American settlers and immigrants were attracted to settle in the west due to availability and accessibility of cheap land for farming, ranching, and logging with hundred of thousands of people obtaining land through Homestead Act. The enticement was further increased by the discovering of precious minerals and metals such as gold, silver, and copper. The greatest contribution to the development of the west was the railroad and its growth. However, there native American already present in the West and were not consulted on westward expansion. Hence, peace with native was not a factor to encourage the settlement.
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