Final answer:
The Trans-Continental Railroad was built by various groups, including European immigrants, African Americans, Mexican and Native Americans, and Union and Confederate war veterans, but not by Chinese immigrants.
Explanation:
Chinese immigrants were not involved in building the Trans-Continental Railroad. The construction was carried out by various groups, including European immigrants, African Americans, Mexican and Native Americans, and Union and Confederate war veterans. Chinese laborers played a significant role in building the railroad, as they were recruited by the Central Pacific Railroad to work on the western half of the project.
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