I'll help this discussion with the 1800s. We received a lot of Irish and Italians who weren't well-skilled and were discriminated against terribly. The draft riot in NY in the Civil War were unskilled Irish worried the Blacks would move north and pass them in the pecking order.
The Germans sent us some very skilled people, but many non-skilled people. Those came over and moved to Ohio, Indiana Iowa, and Wisconsin.
Many of the Scotch-Irish that came over were unskilled and became dirt farmers (my personal family history).
The Chinese started coming in, unskilled, and we used them to build railroads.
America isn't struggling to produce CEOs, CFOs, and managers. We are struggling to fill lower end jobs. Most restaurants are still short-staffed. Anyone can Google the words "farm labor shortage". We are woefully short of people in that area. In fact, Google "unskilled labor shortage" and see what appears.