Although this year's summer holiday festivities were restricted because of the COVID-19 pandemic, certain traditions of this holiday weekend were still in evidence everywhere. Otherwise-quiet neighborhoods exploded with the bright lights and loud roars of fireworks; backyard barbecues smoked away, filling the air with the delicious smells of food on the grill; and people flew flags, hummed patriotic songs, and searched online for Boston Pops renditions of John Philip Sousa's marches. All of these July 4th customs have a surprisingly long history; many would be quite familiar to our ancestors.