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When did the American Railway Union begin its boycott of Pullman cars?

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shantytown in Chicago — Pullman Strike A shantytown on the lakefront in Chicago during the Pullman Strike and general economic downturn of 1893–94.

The American Railway Union (ARU) began its boycott of Pullman Palace Car Company cars on June 26, 1894.1

While the ARU delegates had passed a motion on June 22 to initiate the boycott, they provided the company until June 26 to agree to arbitration. After the company refused to negotiate, the boycott commenced on that date.1