1973 being one of the first to do so. Tarija producers modernized using European equipment and methods and soon displaced other production centers. Today most of Bolivia's grape, wine, and singani industry is centered in Tarija. However, since the year 2000 there has been a resurgence of interest in the original Cinti region, and there are several small producers located there who are reinvigorating early brands. Over time, as the industry matured, the largest manufacturers of singani settled on a single grape variety for their product, and this plus altitude minimums for vineyards began to be codified in national regulations. Legal environment Unlike neighboring pisco which spread itself across two contending countries, singani has always been made only in the territory of Bolivia, and no domain controversy exists as it has for pisco. An exclusive regional product for over 400 years, Bolivia only in recent decades has moved to protect its interests. Part of the motivation was to establish standards so that moonshine could not be called singani. Another impetus was to solidify control of the singani name, the unsatisfactory experience of pisco and of tequila which can be exported in bulk and bottled under foreign labels being cases in point. Bolivian Supreme Decree 21948 (1988) declares singani an exclusive and native product of Bolivia, where the word singani cannot be otherwise used, or modified for use, outside of its stated purpose. National Law 1334 of 1992 establishes the domain of origin (DO) classification for singani and the geographical indication (GI), listing specific zones of production. Supreme Decree 24777 (1997) establishes general controls over the DO and prohibited practices. Supreme Decree 25569 (1999) codifies minimum of 1,600 m for altitude wine, and refers to the promotion of altitude singani and wines. Supreme Decree 27113 (2003) describes international enforcement of intellectual property, including the DO and the GI for singani. National Norms NB324001 further defines and controls the process of making singani, it also describes prohibited practices, it spells out the altitude requirement of 1,600 meters for wine, wine products, and cultivars, and sets standards for purity and labeling. Due to international treaties between the US and other countries, national liquors such as pisco (treaty with Chile), cachaça (treaty with Brazil), and tequila (treaty with Mexico) are listed by the US TTB (Alcohol and Tobacco Tax and Trade Bureau) under their own class-type names, and can be used in US commerce