How did the H-1B1 visa (for Chileans) come about?

The H-1B1 visa (for Chileans) came about with implementation of the United States – Chile Free Trade Agreement on January 1, 2004. As a result of this agreement, Chilean nationals became eligible for the treaty-established visa known as the H-1B1 FTA Professional Visa [Free Trade Agreement (FTA) Professional Visa].