Well, nowadays, it's kinda hard to know which is american and which is not. I say this in part because Bushnell is a US company, but it's Elite scopes are made in Japan. Doesn't quite matter to me because the Elites are SUPERB scopes.
Leupold is a US company, and I think that all of their glass is made here too, but I could be wrong.
Still, whether US or foreign, the old Tasco scopes were not something that I would buy. Nope, you can't go wrong with a fixed (or variable) Leupold, but don't overlook the Elites - because I think that they are just as good, if not better, than the Leupolds (except the LPS).
Zachary