Port wine be labelled as "port" or "Porto". In the United States, wines labelled "port" may come from anywhere in the world, while the names "Oporto", "Porto", and "Vinho do Porto" have been recognized as foreign, non-generic names for port wines originating in Portugal. Port is produced from grapes grown and processed in the demarcated Douro region. The wine produced is then fortified by the addition of a neutral grape spirit known as aguardente in order to stop the fermentation, leaving residual sugar in the wine, and to boost the alcohol content. The fortification spirit is sometimes referred to as brandy but
Texas wine Houston. In recent years this area's wine industry has been hard hit by Pierce's Disease. The high humidity around the northern end of this area makes it difficult to grow vinifera grapes, while vines in the Muscadine family flourish. Roughly in the center is the Texas Hill Country AVA where vinifera is grown. At the far southwest end of this region, along the Mexico–United States border is the state's oldest winery, Val Verde, which has been in operation for over a century, making sweet fortified wines. The central-western third of the state is known as the Trans-Pecos Regions which produces