Pittsburgh's Irish population had already reached 19% by 1790, decades before the Great Famine drove a massive wave of immigration to the US.

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Pittsburgh's Irish population had already reached 19% by 1790, decades before the Great Famine drove a massive wave of immigration to the US.

The city's steel mills, labor movements and political leadership were shaped by Irish workers and their descendants. #StPatricksDay
https://theconversation.com/how-the-emerald-isle-shaped-the-steel-city-pittsburghs-rich-irish-history-278027

How the Emerald Isle shaped the Steel City – Pittsburgh’s rich Irish history

Long before Pittsburgh’s modern Irish celebrations existed, Irish immigrants helped shape the city in the 19th century via the railroads, canals and steel industry.

The Conversation (theconversation.com)