The Progressive Era, roughly the period between the Spanish American War and the U.S. entry into World War I, was a period of transformation, a time when the United States ceased being predominantly an agricultural economy with a minor industrial base and became predominantly a modern industrialized nation. These essays and lesson plans, the result of cooperation between museums, schools, and academic historians, are based on a symposium held at the Hershey Museum June 22-26, 1998. The essays and accompanying lessons address the legacy of Progressive Era industry, the meat packing industry, industrialists, Hershey Chocolate, mass production, working people and the labor situation, the role of the public sector, environmental awareness and regulation, and the City Beautiful Movement and planned communities. (BT)