Andrew J. Russell's "East and West Shaking Hands at Laying of Last Rail" is the most famous photograph taken upon completion of the transcontinental railroad at Promontory Summit, Utah on May 10, 1869. The image shows the chief engineers of the Union Pacific and Central Pacific railroads shaking hands in front of two locomotive engines. Which phase of the O.P.R.Y. analysis might involve looking at the long-term impact of the transcontinental railroad on Westward expansion?

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