People in US eat corned beef on St. Patrick's Day to celebrate the Irish holiday. This tradition started because of the availability of beef and the connection between Irish consumers and kosher butchers. Corned beef has become very popular on St. Patrick's Day in the United States.

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Why Do People Eat Corned Beef on St. Patrick’s Day? | Cabbage, Irish, Americans, & Facts | Britannica

People eat corned beef on St. Patrick’s Day because it was affordable to Irish immigrants in the United States in the 19th century.

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