Yes? Isn’t this a source of discontent in the US?

Yes, which is why we have two houses in the legislature and there are limits on the number of seats in the house and electoral college votes. No polity should be able to procreate their way to political dominance over a peer polity nor should they be able to incentivize law breaking for the same purpose.

And more on point to the subject, imports should be tariffed so that there are not wage benefits to importing products from overseas. It's major bullshit for a country to say "you must have all these employment standards, safety, wage, retirement, health, holidays, etc." for any business in their area and then go and buy competing goods from outside their area with completely different labor standards.