Final answer:
The three key factors for westward movement were the Transcontinental Railroad, discovery of gold in the West, and wide availability of farmland.
Explanation:
The three key factors to the westward movement were:
- The Transcontinental Railroad: Its completion in 1869 facilitated easier and faster travel to the West.
- The discovery of gold in the West: Such as during the California Gold Rush of 1849, attracting people to migrate westward.
- Wide availability of farmland: Promoted by initiatives like the Homestead Act of 1862, offering free land for settlement.
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