The H-1B1 visa (and associated H-1B1 status) is a variant of the H-1B visa in the United States for nationals of Singapore and Chile.[1][2] The version for Singapore is called the H-1B1-Singapore and the version for Chile is called the H-1B1-Chile. These categories were introduced with the Singapore–United States Free Trade Agreement[2] and Chile–United States Free Trade Agreement[1][3] respectively, both of which were ratified in 2003 by the 108th United States Congress (and signed into law by George W. Bush, the President of the United States at the time) and became active on January 1, 2004. The visas are also called FTA visas because they were provided for through Free Trade Agreements (FTAs).
H-1B1 is distinct from the E-3 visa for Australian nationals, even though both are variants of the H-1B. It is also distinct from the TN visa and associated status for residents of Canada and Mexico, which is associated with the North American Free Trade Agreement (NAFTA).