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Tensions between Yankees and Irish Americans in Boston, Massachusetts, erupted in the Broad Street Riot.

Yankee

Term for people from the United States

The term Yankee and its contracted form Yank have several interrelated meanings, all referring to people from the United States. Their various meanings depend on the context, and may refer to New Englanders, the Northeastern United States, the Northern United States, or to…
Source: Wikipedia (CC BY-SA)

Irish Americans

Americans of Irish birth or descent

Irish Americans are ethnically Irish people who live in the United States, whether immigrants from Ireland or Americans with full or primarily Irish ancestry.
Source: Wikipedia (CC BY-SA)

Broad Street Riot

1837 brawl between Irish Americans and firefighters in Boston, Massachusetts

The Broad Street Riot was a massive brawl that occurred in Boston, Massachusetts, on June 11, 1837, between Irish Americans and Yankee firefighters. An estimated 800 people were involved in the actual fighting, with at least 10,000 spectators egging them on. Nearby homes were…
Source: Wikipedia (CC BY-SA)