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In page Pennsylvania:

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In the beginning of the 20th century, Pennsylvania's economy was centered on steel manufacturing, logging, coal mining, textile production, and other forms of industrial manufacturing. A surge in immigration to the U.S. during the late 19th and early 20th centuries provided a steady flow of cheap labor for these industries, which often employed children and people who could not speak English from Southern and Eastern Europe.[citation needed] Thousands of Pennsylvanians volunteered during the Spanish–American War. Pennsylvania was an important industrial center during World War I. The state provided over 300,000 soldiers during the war. On May 31, 1918, the Pittsburgh Agreement was signed in Pittsburgh, signed by Tomáš Masaryk and established Czechoslovakia as an independent nation.