Bloody Sunday happened on January 30, 1972 in Derry, Northern Ireland. This happened because there was a march against imprisonment without trail and British soldiers killed 14 unarmed civilian protesters.
On October 5, 1968 in Derry, Nothern Ireland the NICRA organized a march against discimination and gerrymandering and was banned when some said that they would fight against it. The March was done anyways and resulted in a riot.
In April 20, 1998 an agreement called the Good Friday Agreement was signed and was mainly focused on a peace agreement between Ireland and Britain and made Ireland's governments cooperate.