Geographical Location - Pennsylvania
- Adena
- Adena Mound Builders Live in North America
- Alien and Sedition Acts
- AME Church Is Founded
- American Anti-Slavery Society Is Founded
- Anthracite Coal Strike
- Anti-Irish Riots
- The Art of Radio Develops from Early Broadcast Experience
- Articles of Confederation
- Battle of Brandywine
- Battle of Fort Duquesne
- Battle of Germantown
- Battle of Gettysburg
- Battle of Monongahela
- Battles of Gettysburg, Vicksburg, and Chattanooga
- Carlisle Indian School
- Cement Manufacturers Agree to Cooperate on Pricing
- Commercial Radio Broadcasting Begins
- Community Antenna Television Is Introduced
- The Congress of Industrial Organizations Is Formed
- Declaration of Independence
- Declaration of the Rights of Women
- Donora, Pennsylvania, Suffers Deadly Temperature Inversion
- Episcopal Church Is Established
- First African American University
- First Commercial Oil Well
- First Continental Congress
- First Fugitive Slave Law
- The First Homeowner’s Insurance Policies Are Offered
- The First Nickelodeon Film Theater Opens
- The First U.S. Commercial Nuclear Plant Opens
- First U.S. Political Parties
- Flosdorf Demonstrates Freeze-Drying of Food
- Free African Society Is Founded
- Gene Therapy Test at University of Pennsylvania Halted After Man Dies
- Indian Delegation Meets with Congress
- Iroquois Confederacy-U.S. Congress meeting
- Ivy Lee Sets a Precedent for Public Relations
- Jackson vs. the Bank of the United States
- King George’s War
- Live Aid Generates Millions for Famine Relief
- Million Woman March Draws Many Thousands to Philadelphia
- Müller Develops the Field Ion Microscope
- Northeast States Abolish Slavery
- Paxton Boys’ Massacres
- Pennsylvania Is Founded
- Pennsylvania Society for the Abolition of Slavery Is Founded
- Pittsburgh Residents Form GASP to Combat Air Pollution
- Salk Develops a Polio Vaccine
- Second Continental Congress
