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>>/233308/ In the 1800s, Pennsylvania was a key state in America's industrial and economic growth. It became a center for coal mining, iron, steel production, and railroads, particularly in cities like Pittsburgh and Philadelphia. Philadelphia was also a hub for political, cultural, and educational developments. Rural Pennsylvania remained largely agricultural, with farming communities spread across the state. The state played a significant role in the Civil War, supplying troops and resources to the Union. Its diverse population included European immigrants who came for job opportunities in the growing industries. t. ChatGPT