To speed this simulation up, I'm gonna stop posting about each International tournament and instead just focus on the decade reviews.
Please leave a comment if you would like to see anything else in the next decade review!
Best teams
Southampton: Champions League (2071), Premier League x7 (2070-75, 2078), FA Cup x3 (2072, 2074, 2079), Carabao Cup x4 (2070, 2073, 2075, 2077)
Barcelona: Champions League x2 (2070, 2078), La Liga x3 (2072, 2073, 2078), Club World Cup (2073), Europa League (2077), Spanish Cup x4 (2070, 2074, 2075, 2078)
Leeds: Champions League x2 (2075, 2079), Premier League x3 (2076, 2077, 2079), FA Cup (2077), Europa League x2 (2072, 2076)
Hamburg: Champions League (2077), Bundesliga x6 (2070, 2072, 2076-79), DFB-Pokal x5 (2070, 2072, 2073, 2075, 2077)
Pescara: Champions League (2073), Serie A x5 (2072, 2076-79), Italian Cup x3 (2070, 2077, 2079)
Timeline
2070
> Barcelona wins the Champions League, beating Lyon 2-0 in the finals
> Southampton wins the Premier League, Man City finishes in 2nd. Sheffield United comes 4th, Charlton finishes 5th, Tottenham finishes in 11th, Chelsea comes 15th.
> Real Madrid wins La Liga, finishing 2 points above Barcelona in 2nd, Tenerife finishes in 4th.
> Juventus wins their first Serie A title since 2033, ending Lazio's 8-year streak of winning it. Lazio falls to 3rd, with Roma finishing above them. Parma comes 6th.
> Hamburg wins the Bundesliga, Stuttgart falls to 5th, Dortmund finishes all the way down in 12th, Leverkusen gets relegated.
> Lyon wins Ligue 1 for the 6th straight season, finishing 14 points above Angers SCO in 2nd. RC Lens comes in 3rd.
2071
> Southampton beats Barcelona 3-1 in the Champions League final.
> Southampton wins the Prem for the 4th season in a row, Sheffield United comes in 3rd, Leeds finishes 5th, Newcastle comes 6th, Chelsea finishes 12th, Charlton falls from 5th to 14th, Brighton falls from 7th to 15th.
> Valencia beats Real Madrid 4-2 on the final day of the season to win La Liga. The two teams were level on points before the game.
> Lazio reclaims the Serie A title, Pescara comes in 2nd, Juventus falls to 5th, Entella comes 6th, Napoli comes in 15th.
> Schalke wins the Bundesliga, finishing with 4 more points than 2nd-place Bayern. Dortmund bounces back by coming 6th.
> Lyon wins Ligue 1 for the 7th straight year, they have won 9 of the past 10 seasons. Marseille falls to 7th.
2072
> Bayern Munich wins the Champions League for the first time since 2013 by beating Man United on penalties in the final.
> Southampton wins the Premier League for the 5th straight season, Tottenham finishes 3rd, Sheffield United falls to 5th, Leeds falls to 10th, Arsenal comes 13th, Liverpool finishes 17th but survives relegation comfortably.
> Barcelona wins La Liga, finishing with 6 more points than Real Madrid in 2nd. Tenerife finishes 3rd, Sevilla gets relegated again.
> After years of challenging for the Serie A title, Pescara finally wins it for the first time, beating out Milan by 2 points despite failing to win their final 3 games. Lazio falls to 3rd, Entella falls from 6th to 17th.
> Hamburg wins the Bundesliga, Beating out Schalke, who drew their last 3 games, to the title by 3 points. Frankfurt comes 5th, Dortmund finishes in 11th, Monchengladbach comes in 12th, Leverkusen gets relegated again
> Lyon wins Ligue 1 again, Marseille bounces back by coming 2nd, RC Lens falls to 6th, Monaco finishes 9th.
2073
> Pescara wins the Champions League, beating Barcelona 2-1 in the final
> Southampton wins the Premier League again, Leicester comes in 2nd, Leeds finishes 3rd, Chelsea bounces back with a 5th place finish, Man United falls to 6th, Man City comes in 8th, Liverpool finishes 10th, Sheffield United falls from 5th to 12th, Arsenal finishes in 13th, Charlton falls from 6th to 19th and gets relegated after a period of 6-7 years of consistent top-7 finishes.
> Barcelona wins La Liga by 1 point over Real Madrid, after beating Real in the 2nd-last game of the season
> Lazio reclaims the Serie A title, beating Pescara to the title by 2 points. Sassuolo finishes in 6th, Roma falls to 7th, Juventus finishes 10th
> Bayern wins the Bundesliga, finishing 7 points above 2nd-place Hamburg. St. Pauli finishes 5th, Dortmund recovers by coming 7th, Monchengladbach finishes in 12th, Leverkusen gets promoted.
> Angers SCO beats PSG to the Ligue 1 title by 2 points and Lyon by 3 points. Lyon fails to win 3 of their final 4 games to throw away the title and their streak. Marseille falls to 6th.
2074
> Lyon wins their first-ever Champions League by beating Real Madrid 2-0 in the final.
> Southampton wins the Prem for the 7th season in a row, beating Man United on goal difference. Man United threw away a 2 goal lead against 17th place West Brom to draw 2-2 and lose the title and make West Brom stay up. Leeds finishes 4th, Leicester falls to 5th, Sheffield United bounces back by coming 7th.
> Valencia wins La Liga on head-to-head over Barcelona, despite having a worse goal difference than them by 23 goals. Barcelona also failed to win 3 of their last 4 games.
> Milan wins their first Serie A title since 2011 by only losing 2 games all season. Lazio falls to 4th, Roma finishes 7th, Juventus comes in 10th.
> Schalke wins the Bundesliga by a comfortable 10 points. Bayern falls to 3rd, Dortmund comes 5th, St Pauli falls from 5th to 14th, Monchengladbach comes 15th, Leverkusen survives relegation by winning the playoff.
> Lyon wins the treble, by winning Ligue 1 and the French Cup. Bordeaux comes in 2nd, Angers SCO falls to 4th.
> Argentina wins the World Cup, which means they have won 3 of the last 4 World Cups.
2075
> Leeds wins their first-ever Champions League by beating Barcelona 2-1 in overtime in the final.
> Southampton wins the Premier League again, Sheffield United comes in 3rd, Leeds finishes 4th, Chelsea finishes 5th, Liverpool finishes 6th, Man City comes in 9th, Arsenal and Spurs finish 12th and 13th.
> Real Madrid wins one of the closest La Liga seasons ever, with the top 4 separated by just 4 points, with Real on 87, Barcelona on 85, and Valencia and Tenerife on 83.
> Milan wins the Serie A again, beating Pescara to the title by 6 points. Pescara dropped 8 points in their final 5 games, while Milan won all of their last 5. Parma finishes 4th, Juventus comes 5th, Bologna finishes 6th, Lazio falls to 9th, Napoli finishes 10th.
> Schalke wins the Bundesliga by 3 points over Bayern. Frankfurt finishes 5th, Monchengladbach comes in 12th, Leverkusen gets relegated.
> Lyon wins Ligue 1 again, RC Lens finishes 2nd, Bordeaux falls to 5th, Angers SCO comes in 6th.
2076
> Man United wins the Champions League for the first time since 2050 by beating PSG 2-1 in extra time in the final.
> Leeds wins their first Premier League title since 1992, beating Southampton to the title by 3 points after beating them 2-0 on the second-to-last game of the season. Sheffield United comes in 3rd, Brighton finishes in 5th, Arsenal and Liverpool finish 11th and 12th.
> Tenerife wins their first-ever La Liga title in a title race that was even closer than last season, with Tenerife finishing on 97 points and Barcelona and Real Madrid right behind them on 96 points. Real Madrid failed to win their last 3 games to throw the title away.
> Pescara easily wins the Serie A, picking up 18 more points than 2nd-place Lazio. Juventus bounces back by finishing 3rd, Parma comes in 4th, Milan falls from 1st to 7th, Roma finishes 15th.
> Hamburg beats Bayern to the Bundesliga title by 2 points, after beating them on the second-last day of the season. Monchengladbach finishes 8th, Stuttgart comes in 12th.
> RC Lens wins their first-ever Ligue 1 title in dominant fashion, picking up 100 points while 2nd place Lyon only managed to get 77 points.
> Serbia pulls off the most shocking Euros run of the sim, beating Holland 3-2 in extra time in the final, after defeating England 4-2 in extra-time in the semis and beating Italy on penalties in the Quarter-Finals.
> Spain defeats Brazil in the final of the Olympics, France gets 3rd place
> Argentina defeats Uruguay 2-1 in extra time of the Copa America final.
2077
> Hamburg wins their first Champions League since 1983 (96 years) by beating last year's winners Man United 2-1 in the final.
> Leeds wins the Premier League again, Man United finishes in 2nd, 9 points behind Leeds. Sheffield United comes 3rd, Southampton falls to 4th, Chelsea, Tottenham, Man City, and Arsenal all finished in the 5-8 spots, Liverpool comes in 12th.
> Real Madrid dominates La Liga, losing only 1 game and picking up 103 points, 8 more than 2nd place Barcelona. Tenerife falls to 4th.
> Pescara wins Serie A again, picking up 9 more points than Juventus in 2nd. Lazio falls to 4th, Bologna and Parma finish 6th and 7th, Roma finishes 12th.
> Hamburg wins the treble by winning the Bundesliga by 1 point over Schalke and winning the DFB-Pokal. Frankfurt comes in 4th, Leipzig falls to 6th, Monchengladbach finishes 10th, Stuttgart comes in 11th, Leverkusen gets relegated.
> RC Lens wins their 2nd-straight Ligue 1 title, picking up 7 more points than 2nd place Lyon. PSG falls to 7th.
2078
> Barcelona wins their second Champions League of the decade by beating reigning champions Hamburg 1-0 in the final.
> Southampton reclaims the Premier League title, beating Man United to the title by 3 points and Leeds by 4 points. Sheffield United comes in 4th, Newcastle finishes 6th, Arsenal comes in 10th, Chelsea falls to 13th.
> Barcelona completes an invincible season in La Liga, winning 33 games and drawing the other 5 to tie their own record of 104 points. Barcelona also won the Spanish Cup, meaning that a team won the treble for the 2nd year in a row.
> Pescara wins Serie A for the 3rd season in a row, beating Inter to the title by 8 points. Udinese comes in 5th, Napoli finishes in 11th.
> Hamburg wins the Bundesliga for the 3rd season in a row by losing only 2 games all season. Leverkusen finishes all the way down in 7th in the 2. Bundesliga.
> RC Lens wins a 3rd straight Ligue 1 title by losing only 1 game. Lyon finishes 2nd again, 7 points behind Lens, Angers SCO falls to 7th.
> Spain becomes the first European country to win the World Cup since Italy in 2058, they beat England in the final. Wales wins 3rd place.
2079
> Leeds wins the Champions League again, dominating Hamburg 4-1 in the final
> Leeds also wins the Premier League but fails to win the FA or Carabao Cup, meaning the treble streak ends at 2. Sheffield United finishes 2nd, Arsenal comes in 3rd, Man City finishes 4th, Southampton falls all the way to 7th, Chelsea comes in 12th.
> Tenerife wins La Liga by 1 point over Real Madrid and by 4 points over Barcelona.
> Pescara wins Serie A again, picking up 9 more points than 2nd place Lazio. Napoli finishes 11th, Roma comes in 12th.
> Hamburg wins the Bundesliga for a 4th straight season. Wolfsburg comes in 4th, Dortmund comes in 8th, Monchengladbach finishes in 10th, Leverkusen gets promoted.
> RC Lens wins a 4th straight Ligue 1 title, finishing with 6 more points than 2nd place Lyon. AJ Auxerre finishes 6th.