By Tobias Carroll A host of towns and cities across the United States hold celebrations commemorating the nation’s independence on the 4th of July. And in that case, the history of July 4th in Piscataway, a town in central New Jersey, is not unique. What is unique about it, however, is the origin of that town’s particular celebration. In 1778, a proclamation calling for a celebration was issued by a leader in the country’s military — one George Washington. Why Piscataway? As the town’s historical museum, the Metlar-Bodine House Museum notes, it was because Washington was camped in the area wit…