sentences:  She was also the largest full rigged ship ever built in the United States.Designed by naval architect and shipbuilder Donald McKay as a four-deck four-masted medium clipper barque, "Great Republic"—at 4,555 tons registry—was intended to be the most profitable wooden sailing ship ever to ply the Australian gold rush and southern oceans merchant trade.The ship's launch was planned for September 4, 1853—builder Donald McKay's birthday—but it was postponed to October 4 due to problems with the timber supplies.