The retort pouch is basically just a high tech can. It is made of laminated films instead of metal.
If you check out the regular canned foods, like sardines, you will find that many of them are canned outside of the US. You would be hard pressed in the US to find a can of Corned Beef that is not from South America.
Of course, it is no surprise that products like coffee or bananas are almost always imported, but if you look close at labels you will probably be surprised at how much of your food comes from other countries.
I will not get off on the political rant about imported products, but just add: Why should retort pouches be any different from other foods?