Which best describes why Chinese workers were used to construct a trans continental railroad

Many immigrants from china shifted to US in search of better livelihood during the mid nineteenth century and they were employed in the construction of Transcontinental railroads.

Explanation:

Many Chinese immigrants joined the construction company and they were employed in the construction of transcontinental rail rods which extended from Atlantic to Pacific coast. They increased their standard of living and advanced to modernity but suffered a great back lash of racial discrimination.

Most of the young Chinese males who migrated from china to US were mostly from peasant families. Many loan companies started to operate which encouraged the Chinese to take loans in order to reach US and earn their livelihood. Americans who observed the plight of the Chinese observed them to be the rich source of cheap labor and employed them in the construction of transcontinental railroads.