The issues are that of a nationalist/religious kind. Back in the 16th and 17th centuries, England invaded and colonized Ireland, creating a puppet state that lasted until 1801 when they Kingdoms of Great Britain and Ireland united into the Kingdom of Great Britain and Ireland.
Fast forward to the early Interwar period and you got the Irish War of Independence, which resulted in the partition of Ireland, with 26 counties being sovereign, independent Irish (Free State) territory and the northeastern 6 (known as Northern Ireland) remaining British. In 1937, Ireland got their constitution and in 1948, formally became the Republic of Ireland.
Fast forward to late 60s and you got The Troubles, an ethno-nationalist conflict between the Irish Catholics including various Irish Republican paramilitaries, as well as the Northern Irish Protestants and the Ulster Loyalist paramilitaries. This was a bloody conflict involving riots, terrorist attacks, and so-called peace lines, dividing Catholic and Protestant neighborhoods.
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