Answer:
by using scientific methods to date key events
Explanation:
The bulk of railroad employees were African Americans, Chinese, and Irish immigrants.
The railroad was the most significant business in which African Americans worked after the Civil War since many Southern companies would rent, buy, or possess slaves. The railroad building project known as the Union Pacific Rail Road, which extended from the Missouri River to the Pacific, mostly used Irish immigrants as laborers. On the other side, the Central Pacific Railroad used Chinese workers, who made up about 80% of the workforce by the year 1868.
More than 40 million immigrants entered the country between 1800 and 1950, demonstrating the wide range of labor available. Chinese and Irish immigrants, as well as certain veterans of the Union and Confederate armies, built the majority of the first railways that were constructed in the US. To name a few of the occupations required during the construction of the railway, blacksmiths, carpenters, engineers, masons, surveyors, truck drivers, telegraphists, and even chefs were required.
Learn more about Chinese and Irish immigrants:
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One of the main ways in which machines changed workers’ lives was that "<span>They divided labor into many small tasks," since this brought about a "specialization in labor," which caused production to be more efficient. </span>
I think you forgot to give the choices along with the question. i am answering the question based on my knowledge and research. <span>The person most known for contributing to the final form of the constitution was James Madison. I hope that this is the answer that has actually come to your desired help.</span>
