A look back at key events that took place in February 1973 that contributed to The Troubles in Northern Ireland.

A look back at key events that took place in January 1973 that contributed to The Troubles in Northern Ireland.

A look back at key events that took place in December 1972 that contributed to The Troubles in Northern Ireland.

A look back at key events that took place in November 1972 that contributed to The Troubles in Northern Ireland.

A look back at key events that took place in October 1972 that contributed to The Troubles in Northern Ireland.

A look back at key events that took place in September 1972 that contributed to The Troubles in Northern Ireland.

A look back at key events that took place in August 1972 that contributed to The Troubles in Northern Ireland.

A look back at key events that took place in July 1972 that contributed to The Troubles in Northern Ireland.

A look back at the key events that took place in June 1972 that contributed to The Troubles in Northern Ireland.

A look back at key events that took place in May 1972 that contributed to The Troubles in Northern Ireland.

A look back at key events that took place in April 1972 that contributed to The Troubles in Northern Ireland.

A look back at the key events from March 1972 that contributed to The Troubles in Northern Ireland.

A look back at key events that took place in February 1972 that contributed to The Troubles in Northern Ireland.

A look back at key events that took place in January 1972 that contributed to The Troubles in Northern Ireland.

A look back at key events that took place in December 1971 that contributed to The Troubles in Northern Ireland.

A look back at key events that took place in November 1971 that contributed to The Troubles in Northern Ireland.

A look back at key events that took place in October 1971 that contributed to The Troubles in Northern Ireland.

A look back at key events that took place in September 1971 that contributed to The Troubles in Northern Ireland.

A look back at key events that took place in August 1971 that contributed to The Troubles in Northern Ireland.

A look back at key events that took place in July 1971 that contributed to The Troubles in Northern Ireland.