The first transcontinental railroad was largely built by Irish and Chinese immigrants. The correct option among all the options that are given in the question is the first option or option "a". Approximately two thirds of the workers were Chinese immigrants. I hope it helps you.
The Answer Is:
(A.) "Their success encouraged people to experiment and invent new products"
Answer:
Islam unified the Middle East economically and sometimes politically. Its had a substantial influence and has helped define the region.
They used accurate observations in their work.
