1. Signing of the Declaration of Independence: On August 15, 1776, the Pennsylvania delegation to the Continental Congress, including Benjamin Franklin and John Morton, signed the Declaration of Independence in Philadelphia, officially declaring the thirteen American colonies as independent from British rule.

2. Battle of Chester: On August 15, 1777, during the American Revolutionary War, British troops under General William Howe landed at Chester, Pennsylvania, and engaged with American forces. Despite being outnumbered, the Americans were able to delay the British advance before withdrawing.

3. Opening of the Erie Canal: On August 15, 1829, the Erie Canal officially opened, connecting the Hudson River with Lake Erie and revolutionizing transportation in New York and Pennsylvania. The canal allowed goods to be transported faster and cheaper and enabled the growth of industry and economy in both states.

4. Black History Milestone: On August 15, 1938, the first interracial college basketball game in the United States was played at Haverford College between Haverford and Hampton Institute. The groundbreaking game helped break down racial barriers in sports and society.

5. Celebrating Latino Culture: In recent years, August 15 has been celebrated as National Puerto Rican Day in Pennsylvania, celebrating the culture and contributions of Puerto Ricans to the state and the country. The celebrations typically include parades, music, and food festivals.