Write a summary about the westward expansion.

Westward expansion, the 19th-century movement of settlers into the American West, began with the Louisiana Purchase and was fueled by the Gold Rush, the Oregon Trail and a belief in "manifest destiny." A variety of factors contributed to Westward Expansion, including population growth and economic opportunities on what was presented to be available land. Manifest Destiny was the belief that it was settlers' God-given duty and right to settle the North American continent.

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i believe it would influence their own way of understanding things. it shall be a foundation where they can draw or start an argument.   historians are also  scientists that  have their tools of analysis and expertise to unlock a variety of difficulties such as relationships of man, origin, politics, economy, and culture. based on facts and understanding on these areas, they may shade light to extract ideas and develop options to validate a hypothesis or debunk it.