22,000 were killed or injured. It was a result of "carelessness" on the part of the workers (as said in coursehero.com)
From victory at Guadalcanal, the Allies were able to launch the Central Pacific drive and subsequent offensive operations against which the Japanese could only defend with fewer and fewer naval, aerial, and army assets. Guadalcanal, not Midway, probably turned the tide irreversibly for the Allies in the Pacific.
D white settlers I’m pretty sure the railroad hired Chinese immigrants Irish and freed slaves (google stated that California railroad company’s hired these people) this makes sense Any way because there were so many Irish, freed slaves and Chinese immigrants it would make sense to give them that job so D white settlers sorry that took so long this is my first time answering people’s questions wanted to get it right so the answer is d