James K. Polk

'Hanging of the San Patricios following the Battle of Chapultepec' by Samuel E. Chamberlain depicts a multiple execution in the aftermath of one of the battles of the Mexican-American War.

During the Mexican-American War, Irish-Americans Fought for Mexico in the 'Saint Patrick's Battalion'

Anti-Catholic sentiment in the States gave men like John Riley little reason to continue to pay allegiance to the stars and stripes

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