Also, don't forget that there are a lot of countries that buy products made in the USA. If they decided to buy only domestic products it would really put the hurt on a lot of American businesses.
When I started working for HP (Hewlett Packard) back in 1988 fully half of the annual business ($12 billion at the time) was made up of foreign sales. This percentage increased over time. Many large (and some small) companies report large overseas sales figures.
The perceptive buyer can make good choices in products based on a number of market conditions, country of origin being one of them. Personally, I try to avoid products made in China for the most part for a lot of personal reasons.
I never give it a thought when buying firearms. It is the company, the model, the reputation, the performance that counts. USA, Austria, Japan, Belgium, Italy, and Brazil (unfortunately) are the countries represented in my gun safe at the moment.
Dan