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.

Images References
[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.

[1] European League of Football Facebook Page (2021) Profile Picture, February 4, 2021 [Internet] Available from: https://www.facebook.com/europeanleagueoffootball/photos/a.100150555247238/159345569327736/ [Accessed 27 April 2021]
World American Football Leagues have been around since 1991 when the National Football League (NFL) established the World League of American Football in USA, Canada and Europe.
Since then they have reached India and China, as well as the Legends Football Leagues (Women’s) establishing Leagues in Canada, Australia and Mexico
World Football Leagues
World Pro American Football Leagues (Bowl Games):
World Pro American Football Leagues Bowl Games 1991-2019
Major Alternative Football Leagues Standings:
World Pro American Football Leagues (Overviews):
Amsterdam Crusaders Independent Schedule American Football Team 2018
Pretty Girls Football League (Mexico) 2014-2017
China Arena Football League 2016-2019
Legends Football League Global 2012-2014
Elite Football league of India 2012
United Football League 2009-2011
National Football League Europe 1998-2007
World League of American Football 1995-1997
American Football League of Europe 1993-1995
Hamburg Blue Devils Independent Schedule American Football Team 1993
World League of American Football 1991-1992
World Football Leagues (Seasons)
China Arena Football League 2019
Amsterdam Crusaders Independent Schedule 2018
Legends Football League Australia 2013-14
Lingerie Football League Canada 2012-13
American Football League of Europe 1995
European League of American Football 1993
Hamburg Blue Devils Independent Schedule 1993
Leagues which failed to start
International League of American Football 1990

Irish-Born World Professional Players, Coaches & Personnel:
Panthers Wrooclaw ELF (2021), Aviators TSL (2021)
Emmett Waldron | Irish-Born Pro & College American Football Player 1993-1999
(Rice Owls (NCAA), Scottish Claymores (WLAF-NFLE))
Linda Holland | Irish-Born Pro Legends-Arena American Football Player 2014
(Western Australia Angels (LFL Australia))

From the 1920s when the National Football League played other Leagues there has been an International flavour to American Football
Whether it is the NFL versus other American Leagues and Canadian Football Leagues, or American Professional Teams playing in Europe and around the World there are plenty of chances to catch an American Professional Football League game around the World.
National Football League International
National Football League Regular Season International Series
National Football League International Series (Major League)
National Football League International Regular Season Games in London 2007-Present
National Football League International Regular Season Games in Canada 2008-2013
National Football League International Regular Season Games in Mexico 2005-Present
NATIONAL FOOTBALL LEAGUE PRESEASON AMERICAN BOWLS
NFL International
National Football League International (Preseason Games):
National Football League International Preseason American Bowl in Australia 1999
National Football League International Preseason American Bowl in Mexico 1994-2001
National Football League International Preseason American Bowl in Japan 1989-2005
National Football League International Preseason American Bowl in Canada 1988-Present
National Football League International Preseason American Bowl in Europe 1986-1997

Canadian and American Football Leagues International
AAA American Football Leagues International
The Spring League v Japan American Football Association 2020
Arena Football League All Star Game in China & Hawaii 2013
Legends Football League Pacific Cup 2012-2013
Arena Football League Preseason Games in Europe 1989
United States Football League Postseason Exhibition Game in London 1984
AA Minor American Football Leagues International
Intercontinental Football League European Championship 1976-1978
Intercontinental Football League European Championship (Seasons): 1978 1977 1976
Featured Image
Images
[1] 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]