United States, June 29 -- Nissan is celebrating America's 250th anniversary with a limited?run 250th Anniversary Edition of the U.S.-assembled Frontier pickup truck, revealed as the nation prepares for Fourth of July celebrations.Limited to just 2,500 units assembled through the month of July, the 250th Anniversary Edition features a special monochromatic Stars and Stripes design on the Frontier tailgate.The exclusive Stars and Stripes tailgate badge comes at no additional charge, and will be available exclusively on PRO-4X models, including short wheelbase, long wheelbase, and Roush variants, and will be offered across the existing exterior color lineup.The 250th Anniversary Edition also coincides with a special milestone for the model - t...