Although Dallas and Fort Worth are the ninth and 16th largest cities in the US respectively, the 12 county area that comprises the DFW Metroplex is the fourth largest metropolitan area in the United States (after Chicago, Los Angeles, and New York City) with a population of 6,426,214 according to the 2010 US Census.
All beer is created with yeast, but there are filtration processes that can remove yeast from the final product. All domestic beer in the United States such as Budweiser is yeast-free by law.
But lager yeast behaves in a profoundly different manner than ale yeast. The most obvious difference is that lager yeast works best in cold temperatures -- temperatures that would make an ale yeast go dormant. Further, unlike ale yeast, no wild-type lager yeast has ever been found in Europe and lager yeast need humans to continue its propagation.