Before I posted, I called Lincoln Electric this morning (not 8 to 10 years ago) in order to get clear and specific clarification on the country of origin of models of machines identified by name that are available for purchase in the United States.
It is actually quite easy to take the truth and accept accurate, factual, up to date, and relevant information.
It is much harder to take generalizations and inference. Just because Lincoln has manufacturing plants in China, doesn't mean that the PowerWave S350 is manufactured in China, nor does it mean that any part of an AirVantage is manufactured in Turkey, just because Lincoln owns a manufacturing facility there, and the labor is cheaper there.
The OP was specifically interested in a pulsed Mig machine manufactured in the United States of America that can run .030 solid wire and gas. And I found that Lincoln Electric indeed still offers such a machine, that was still manufactured in the United States, and prior to calling I already suspected this because I happen to own that machine, and have been inside the cabinet several times. In the course of verifying whether the machine I own is still made in the USA (during the phone call this morning) I found out that the successor machine, the Power Mig 360MP, is made in Mexico, along with the younger brother Power Mig 260. This is the type of specific model to model information that might be useful to the OP when making a decision.
Just because Lincoln also sources equipment from Italy (the Invertec line of welders) doesn't mean that every Lincoln welder has Italian parts.