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This could be answered at two levels: the US government through the Pacific Railroads Act (1862) founded the Union Pacific Railroad to build the line from Omaha Nebraska to the California/Nevada line. The workers who actually built the line were largely immigrants (Chinese).
Central Pacific and the Union Pacific Railroad CompaniesIt was build by Chinese laborers
Irish immigrants worked on the union pacific railroad to help build west from Omaha Nebraska. The Union Pacific was in fierce competition with the central pacific railroad so the irish sometimes would sabotage the work of the central pacific.
They helped because of a food famin and needed more money.
he build up the Union Pacific bridge
Central Pacific and the Union Pacific Railroad CompaniesIt was build by Chinese laborers
the Union Pacific and Central Pacific
The invention of a stable form of nitroglycerin, dynamite, in 1869 made the construction of tunnels for such historic rail lines as the Union-Pacific transcontinental route more practicable.
the Union Pacific and Central Pacific
Brigham Young, President of The Church of Jesus Christ of Latter-day Saints, was involved in the construction of the transcontinental railroad in Utah. He obtained contracts with the Union Pacific to build the railroad through Utah. Mormons then built the Union Pacific track in the Utah territory.
A credit mobilier is a construction company set up by several stockholders of the Union Pacific
it took about six years to build the transcontinental railroad