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The concept of setbacks (i.e., the required distance between a structure and a property line) was implemented to provide for adequate distances between buildings to prevent the spread of fires. After the Revolutionary War, a law was adopted that prohibited storing more than 30 pounds of gunpowder within two miles of Philadelphia. For example, an act was adopted in the 1700s that prohibited baking and barrel making except in shops or places built of masonry. Early land use regulations in Pennsylvania and elsewhere were generally concerned with preventing the spread of fires. However, as far back as the 18 th century, land use regulations were enacted in Pennsylvania. Today, a municipality regulates the use of land by implementing a zoning ordinance. Zoning is, at its core, the municipal regulation of the use of land.
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