As the influenza pandemic swept across the United States in 1918 and 1919, masks took a role in political and cultural wars. The masks were called muzzles, germ shields and dirt traps. They gave people a “pig-like snout.” Some people snipped holes in their masks to smoke cigars. Others fastened them to dogs in mockery. Bandits used them to rob banks. More than a century ago, as the 1918 influenza pandemic raged in the United States, masks of gauze and cheesecloth became the facial front lines in the battle against the virus. ...the masks stoked political division...medical authorities urged the...