Chinese immigrants were used to build the transcontinental railroad because they were skilled with a. explosives c. railroad design b. building large structures d. all of the above

The Chinese immigrants were used to build the transcontinental railroad because they have a historical relationship with explosives and building large structures. The Chinese people have a long history of organized civilization. The Chinese were the first to create gun powder and created the great wall of which are examples of their knowledge.

Primary sources are usually  more accurate and are written by someone who experienced it or witnessed it. secondary sources are those who heard of it after the fact that can lose details and or twist the event in a light that benefits them.

1x +5= 44. a number means a variable so 1x +5=44