The American Football League (AAA – Division 2 – League) began playing matches in Canada in 1926, and then played against the National Football League (1930s) and Canadian football League (1940s). These were the first Major American Football (Gridiron) Internationals.
The National Football League began promoting American Football around the World, starting in the 1950s with a series of Internationals versus Canadian Football League teams, and then playing preseason games in first Canada in the 1960s, then in the 1970s Europe, Japan and Mexico. In 2007 the National Football League began playing regular season games in London, Toronto and Mexico City.
Major American Football Leagues have been played outside of the USA since the World League of American Football in 1991. With 6 teams in USA, one in Canada, and three in Europe, it was the first Official National Football League Development League (Division 2), as well as the first league of its kind to be played on a weekly basis on two continents (technically the USSR Soccer League was the first). It became a Europe-only league in 1995 and renamed NFL Europe in 1998 and was scrapped by the NFL in 2007 in favour of promoting the NFL in Europe through regular season game.
The European Leagues were replaced by the United Football League (USA 2009-2011), Elite Football League of India (2012), Legends Football Leagues (Canada 2012-13 and Australia 2013-14), China Arena Football League (2016), Pretty Girls Footbal l League (Mexico 2017) and Alliance of American Football (2019).
Beginning in 1984 AAA (Division 2) American Football Leagues began playing matches in Europe (USFL 1984, Arena Football League 1990s) or against World American Football Teams (Legends Football League USA v Legends Football League Canada 2010s, The Spring League v Japan American Football Association 2020).
Click on the links below (in Green-Blue) to be brought to a page with the standings and results of the specified leagues.
[World Pro 1] World League of American Football (2018) WLAF Logo [Internet] Available from: http://www.worldleagueofamericanfootball.com/sitebuildercontent/sitebuilderpictures/WLAFlogo.gif [Accessed 23 April 2018]
There were no Irish teams in these leagues unless you include the EuroSteelers of the European League (UK Conference) in 1993 (precursor to AFL Europe). the four teams of the UK Conference were intended to represent the four regions of the UK, with the EuroBears, EuroRaiders and EuroMonarchs the other three. The Pittsburgh Steelers were the designated home team for the NFL game in Dublin with the Chicago Bears.
World Football Leagues
World Pro American Football Leagues (Bowl Games):
World Pro American Football Leagues (Overviews):
World Pro American Football League Seasons:
National Football League v American Football Leagues
National Football League v American Football Leagues (1927-1937):
Whilst not strictly speaking International matches, the National Football League has also played matches against American Football League teams in the 1920s, 1930s, & 1940s.
Canadian Football Leagues Internationals
National Football League Preseason American Bowls
National Football League Regular Season International Series
National Football League International Series (Major League)
AAA American Football Leagues International
 World League of American Football (2020) 96claymoresawayjersey50rs.jpg.w300h350 [Internet] Available from: http://www.worldleagueofamericanfootball.com/sitebuildercontent/sitebuilderpictures/.pond/96claymoresawayjersey50rs.jpg.w300h350.jpg [Accessed 17 September 2020]