Ahem, with immigrant labor(Chinese). This is where we got chop suey.
AHEM legal immigrant labor.....
On the western portion of the project. It was the fastest way for that portion of the railroad to get its labor.
And AFAIK, the immigrant labor was all legal at the time. Of course, the facts of the matter often matter little to you, as long as you can make a snide remark in an attempt to make the other side appear wrong.