The document summarizes the conflict in Northern Ireland between Catholics and Protestants from the 1960s to the 1990s. It began as a peaceful civil rights movement by Catholics that faced hostility. Bloody Sunday in 1972, when British troops shot and killed 13 civilians during a protest march, marked a turning point and led to increased violence by both sides. The IRA emerged to use violence against the British army and government. Over 3,000 people were killed total during the decades-long conflict before a peace agreement was reached in 1998, though tensions remained.