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        A devastating potato crisis that resulted in a massive huger leading to the loss of millions of lives and mass emigration, having a lasting impact on the Irish population - 
  
  
        Signed between the UK and Ireland, establishing the Irish Free State and ending the Irish War of Independence. However, it led to the partition of Ireland. - 
  
  
        Ireland became an independent republic and left the British Commonwealth. - 
  
  
        A historic papal visit that drew massive crowds and highlighted the enduring influence of the Catholic Church on Irish society. - 
  
  
        A milestone in the Northern Ireland peace process, ending decades of conflict between Catholic and Protestant communities.