There are often substantial differences depending on the country regarding the determination as to the country of origin. A product that is produced for export in the United States may not be eligible for sale in the United States.
It is wonderful to see and hear of companies keeping production within the United States and bring jobs to Americans as opposed to having production done overseas. All the more so I give these companies credit because to use the term "Made in USA," on products requires strict adherence to the laws. Goods that are distributed in the United States are governed by United States law, and the rules instituted by the Federal Trade Commission ("FTC").
The FTC does not pre-approve claims for labeling products as "Made in USA". In order for a a product to be called "Made in USA," the product must be "all or virtually all" made in the U.S.
What does "all or virtually all" mean?
The FTC states that "All or virtually all" means that all significant parts and processing that go into the product must be of U.S. origin. That is, the product should contain no — or negligible — foreign content.
Therefore, be sure that you have a reasonable basis for complying with the "Made in USA" requirements and have all documentation necessary in case you are questioned.
Happy Importing :)