As we gear up to celebrate the Fourth of July, our realdansnyder got a history lesson ahead of the 250th anniversary of the signing of the Declaration of Independence. The Historical Society of Pennsylvania breaks down the previous centennial celebrations throughout the years and what to look forward to in 2026. #july4th #july4 #fourthofjuly #philadelphia #philly #250th #250thanniversary #centennial #phillyhistory #philadelphiahistory #semiquincentennial