Mostly because the products being made in the USA are being manufactured for industrial use, not consumer use. The manufacturing that has shifted overseas is mostly for high volume, lower margin consumer-purchased items that are typically referred to by economists as non-durable goods. At some level, this has also affected durable goods manufacturing but these goods are more sensitive to exchange rates, transportation costs, and operating efficiencies. Depending on the circumstances of the actual product and market served, some of this manufacturing has returned to US production.
When I speak of industrial goods, I refer to companies that are manufacturing for energy/process industries, aerospace (especially in national defense), automotive to some degree, etc.
Milling machines? China.
Metal lathes? China.
Cutting tools? China.
Robotic and CNC machines? Japan and Germany.
Show me what I'm missing.