The large central twin-handled urn with maize stalks emerging between the handles and four laurel swags suspended around the shoulder, surmounted by a figure of Liberty standing on a broken chain and holding the palm of victory and a scroll inscribed, "Progress," raised on a square pedestal bearing a relief plaque depicting the landing of Columbus and the date 1492, flanked to each side by a large figural group, one side representative of America in the 15th century, depicting two Native warriors, one mounted and in full gallop, the other standing with shield and spear held aloft, above a rocky base with a serpent striking below the horse and a horse skull, above a plaque reading "XV Century;" the other group, representative of America in the 19th century, depicting Columbia in flowing robes on a horse led by Plenty holding a floral bridle, the rocky base bears a cornucopia, two sheaves of wheat, and a collection of various tools and instruments allegorical of the Arts and Sciences, and a figure of a maiden instructing a seated boy how to write, above a plaque reading "XIX Century," all raised on cavetto molded base centered by a plaque reading "America."