Due to construction of the transcontinental railroad, immigration to the western united states during the 19th century mainly involved workers from a) australia. b) china. c) india. d) italy.

Due to construction of the transcontinental railroad, immigration to the western United States during the 19th Century mainly involved workers from China

Explanation:

Chinese immigrants were hired as labourers for the building of transcontinental railroads. Many immigrants from China were living along the West Coast and many of them had arrived during the Gold Rush. These people were hired as cheap labour. As during those times they were considered an inferior race, they were not treated fairly and had to go through racial discrimination. The Chinese were known to be extremely hardworking individuals and therefore they were exploited to the most extent.

the answer would be c. sediment buildup on continental slope

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