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But the West has not overlooked its heritage from the East. On June 8,1975, a Conestoga-style covered-wagon train will leave Elaine, Wash., for a crosscountry trek along routes that the pioneers used to migrate West. The wagons will join others in Valley Forge, Pa., on July 3, in time for the Bicentennial's climactic moment in Philadelphia: a parade with units from all 50 states and a massive fireworks show that will mark the 200th anniversary of the signing of the Declaration of Independence.