Short answers, pulled from the story.
The first international association football match between Scotland and England took place in November 1872. By 1884 all six possible matches were played for the first time with a total of six matches occurring annually.
A section of terracing collapsed due to overcrowding causing twenty-five people to die and over five hundred to be injured. The match was declared void and replayed at Villa Park in Birmingham after play stopped but restarted after twenty minutes.
If teams finished equal on points their position was shared until goal difference became the tiebreaker from 1978 onwards. Total goals scored served as the final criterion if goal difference remained equal.
Waning interest crowded fixture lists and hooliganism rose sharply leading England and Scotland to announce the season would be their last. Fixture congestion made revival impractical according to English officials.
Northern Ireland retained the trophy after winning the final tournament where they won on goal difference after all teams finished with three points each. Wales came second based on goals scored while Northern Ireland had advanced to win the competition.