Antique rugs were once new production. About 80 - 90 years ago, carpets from the orient were sold at extremely high prices throughout Europe. European manufacturers saw the need to produce such products at lower costs, causing a sweep of production through Europe in places such as Donegal and Axminster.
This is the reason that some Donegal rugs can be found with Turkish Oushak patterns. While the need to produce a product for cheaper dominated the "where" of the production, there was still a desire for the cultural feel of an oriental rug. On top of being less expensive to make, there was also more control over how the product was made.