What two poor races of people were exploited to help build the railroad lines quickly and cheaply?

They toiled through back-breaking labor during both frigid winters and blazing summers. Hundreds died from explosions, landslides, accidents and disease. And even though they made major contributions to the construction of the Transcontinental Railroad, these 15,000 to 20,000 Chinese immigrants have been largely ignored by history.

Explanation:

the   square   deal   was   a   program   where   the   government gave any one   a fair   chance   to succeed

jim crow law, in u.s. history, any of the laws in which racial was enforced, in the south between the finish of reconstruction in 1877 and the start of the social liberties development during the 1950s.

jim crow was the name of a minstrel routine( jump jim crow) performed starting in 1828 by its creator, thomas dartmouth ("daddy") rice, and by numerous imitators, including on-screen character joseph jefferson.

the term came to be a defamatory sobriquet for african americans and an assignment for their segregated life. the segregation rule was stretched out to parks, graveyards, theaters, and eateries with an end goal to keep any contact among blacks and whites as equivalents.

it was classified on neighborhood and state levels and most broadly with the "separate yet equivalent" choice of the u.s. preeminent court in plessy v. ferguson (1896).