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In page The Troubles:

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Unionists say the main reason was the formation of the Provisional IRA and Official IRA, particularly the former.[citation needed] These two groups were formed when the IRA split into the 'Provisional' and 'Official' factions. While the older IRA had embraced non-violent civil agitation,[5] the new Provisional IRA was determined to wage "armed struggle" against British rule in Northern Ireland. The new IRA was willing to take on the role of "defenders of the Catholic community",[6] rather than seeking working-class ecumenical unity across both communities.