Timeline

Note: This is copied over from the wiki and this is going to be added onto.

1900s

 * 🇺🇸 October 13, 1903 - The first World Series ends in the Pittsburgh Pirates taking it out 5-4 over the Boston Americans.
 * 🇫🇷 May 21, 1904 - FIFA is formed in Paris, France.
 * 🇫🇷 April 9-May 13, 1906 - The 1906 FIFA World Cup is held in France.
 * 🇫🇷 May 13, 1906 - Uruguay wins the first FIFA World Cup after defeating Austria 4-0 in the final
 * 🇫🇷 June 27, 1906 - The first French Grand Prix finishes in Le Mans with Ferenc Szisz winning the Grand Prix.
 * 🏴󠁧󠁢󠁥󠁮󠁧󠁿 1907 - Manchester United goes bust.
 * 🇦🇺 September 28, 1907 - Championship of Australia is held for the first time in 11 years with Norwood (SAFA) defeating Essendon
 * 🇬🇧 1908 - Netherlands wins the football tournament in London to get their first gold medal.
 * 🇬🇧 April 27-October 31, 1908 - 1908 Summer Olympics is held in London, United Kingdom.
 * 🇬🇧 January 16, 1909 - France joins the Five Nations Championship after playing against the other British nations between 1906 to 1908.
 * 🇮🇹 May 30, 1909 - The first Giro d'Italia ends in Milan with Luigi Ganna winning the tour by one point.

1910s

 * 🇦🇹 April 10-27, 1910 - The 1910 FIFA World Cup is held in Austria.
 * 🇦🇹 April 27, 1910 - England wins their first World Cup after defeating Belgium 2-1.
 * 🇳🇴 1910 - The Nordic Football Championship is held in Norway.
 * 🇺🇸 May 30, 1911 - The first Indianapolis 500 is held
 * 🏴󠁧󠁢󠁥󠁮󠁧󠁿 April 27, 1912 - Everton becomes the first team to win back to back Football League titles
 * 🏴󠁧󠁢󠁥󠁮󠁧󠁿 1912 - The first World Test Championship is held in England.
 * 🇸🇪 July 4, 1912 - Netherlands defends the Olympic football title in Stockholm.
 * 🇸🇪 July 6-22, 1912 - The 1912 Summer Olympics is held in Stockholm, Sweden.
 * Flag of Wales.svg 1913 - The first World Cup qualifer is played in Wrexham.
 * 🇺🇸 February 4-11, 1913 - The first Far Eastern Championship Games is held in Manila, Philippines
 * 🇬🇧 July 28, 1913 - Canada shock the tennis world by defeating the British Isles 3-2 in the International Lawn Tennis Challenge.
 * Flag of Switzerland.svg February 27, 1914 - The last Swiss Tri Tournament is held with Argentina winning the last tournament.
 * 🏴󠁧󠁢󠁥󠁮󠁧󠁿 April 5-25, 1914 - The 1914 FIFA World Cup is held in England.
 * 🏴󠁧󠁢󠁥󠁮󠁧󠁿 April 25, 1914 - Denmark cause a upset in the World Cup final by defeating England in extra time.
 * 🇺🇸 May 30, 1914 - Josef Christiaen becomes the first winner of the Indianapolis 500 to not come from the United States.
 * July 28, 1914 - World War I starts
 * Flag of Brazil (1889-1960).svg September 14, 1916 - CONMEBOL is formed in Sao Paulo
 * 🇨🇦 December 19, 1917 - The first National Hockey League season begins in Canada.
 * Flag of Brazil (1889-1960).svg May 18, 1918 - Copa América first tournament is held in Brazil.
 * November 11, 1918 - World War I ends

1920s

 * Flag of Belgium.svg August 12-September 2, 1920 - The 1920 Summer Olympics is held in Antwerp, Belgium
 * Flag of Belgium.svg August 29, 1920 - Czechoslovakia is disqualifed from the 1920 edition after walking off from the field in the quarter final against Norway.
 * Flag of Belgium.svg September 2, 1920 - Belgium defeats the Netherlands 2-1 in the Olympic final
 * Flag of Denmark.svg August 4, 1921 - The first UCI Road World Championships is held in Copenhagen.
 * Flag of the Netherlands.svg May 10-20, 1922 - The 1922 FIFA World Cup is held in the Netherlands
 * Flag of the Netherlands.svg May 20, 1922 - Belgium wins their first FIFA World Cup title after defeating Netherlands 2-1.
 * 🇫🇷 May 27, 1923 - The first edition of the 24 Hours of Le Mans is held with André Lagache and René Léonard taking out the win.
 * 🇫🇷 May 4-July 27, 1924 - The 1924 Summer Olympics is held in Paris, France.
 * 🇫🇷 June 9, 1924 - Uruguay defeats Italy 1-0 in the Olympic final
 * 🇫🇷 April 13, 1925 - France wins their first Five Nations Championship after defeating England in the final match.
 * 🇮🇹 June 7, 1925 - Alfredo Binda wins his first Giro d'Italia of six titles that he would win between 1925 and 1933.
 * Flag of Spain (1785-1873 and 1875-1931).svg May 10-June 1, 1926 - The 1926 FIFA World Cup is held in Spain
 * Flag of Spain (1785-1873 and 1875-1931).svg June 1, 1926 - Uruguay becomes the first team to win FIFA World Cup twice after defeating the Netherlands 3-2 in extra time.
 * 🇦🇺 September 18, 1926 - Port Melbourne wins their first VFA premiership, the first of what will be four in a row.
 * 🏴󠁧󠁢󠁥󠁮󠁧󠁿 August 9, 1927 - The first British League Cup is held in London with Belfast Celtic F.C defeating Rangers 2-0 in the final.
 * 🇱🇹 August 10, 1927 - Lithuania wins the first Baltic Cup.
 * Flag of the Czech Republic.svg September 2, 1927 - The first Mitropa Cup is held.
 * Flag of the Netherlands.svg June 10, 1928 - Italy defeats Uruguay 2-0 in a repeat of the 1924 Olympic Final in Amsterdam.
 * Flag of the Netherlands.svg June 16, 1928 - The first FIFA World Rankings is revealed with the Netherlands on top.
 * Flag of the Netherlands.svg July 28-August 12, 1928 - The 1928 Summer Olympics is held in Amsterdam, Netherlands.
 * 🇪🇬 April 6, 1929 - Egypt becomes the first team from Africa to qualify through to the World Cup.
 * Flag of Monaco.svg April 7, 1929 - The first Monaco Grand Prix is held with Georges Bouriano taking the victory

1930s

 * July 13-August 10, 1930: The 1930 FIFA World Cup is held in Uruguay. This is the first time that its held in South America.
 * 🇨🇦 August 2-9, 1930: The first British Empire Games is held in Hamilton, Canada. England finished on top of the medal table.
 * August 10, 1930: Netherlands wins the FIFA World Cup for the first time, defeating Argentina by 2 goals.
 * 🏴󠁧󠁢󠁥󠁮󠁧󠁿 October 11, 1930: WEFF is formed in London, England which becomes the first regional confederation.
 * December 6-14, 1930: The first South America Basketball Championship is held in Uruguay.
 * 🇧🇬 October 4, 1931: Yugoslavia takes the first Balkan Cup in Bulgaria.
 * February 13, 1932: The first WEFF Championship qualifier is held in Belfast which also brings the start of 1934 FIFA World Cup qualifying.
 * 🇫🇷 June 19, 1932: The 24 Hours of Le Mans is run again for the first time in seven years with Raymond Sommer and Luigi Chinetti taking the win.
 * 🇺🇸 July 30-August 14, 1932: The 1932 Summer Olympics is held in Los Angeles, United States.
 * 🇺🇸 August 11, 1932: Argentina takes the football competition at the Olympics after defeating the host nation by 4-1. But crowd numbers were down to compared to previous tournaments.
 * 🏴󠁧󠁢󠁥󠁮󠁧󠁿 February 1, 1933: France win the first WEFF Championship by a score of 3-1 against Wales.
 * May 16-20, 1933: The final Far Eastern Championship Games is held in Manila, Philippines.
 * 🇮🇹 May 28, 1933: Alfredo Binda wins his last of six Giro d'Italias in Milan.
 * 🇮🇹 May 12-June 4, 1934: The 1934 FIFA World Cup is held in Italy.
 * 🇮🇹 June 4, 1934: Italy win the FIFA World Cup to become the first host team to win the trophy.
 * January 29, 1935: France defeat Switzerland in the final of the 1935 WEFF Championship.
 * 🇫🇷 February 17, 1935: FIFA brings back the knockout format to the FIFA World Cup for what will be the first time in 28 years.
 * 🇨🇦 April 6, 1935: The last Stanley Cup is won by the Montreal Maroons. This is the same until twelve years when it was brought back.
 * May 7, 1935: Switzerland win the first EuroBasket competition held at Switzerland. But this would be the only success that the Swiss will have in basketball.
 * 🇪🇸 May 15, 1935: Gustaaf Deloor wins the first Vuelta a España to be held.
 * 🇪🇸 July 17, 1936: The Spanish Civil War starts
 * 🇩🇪 August 1-16, 1936: The 1936 Summer Olympics is held in Hamburg, Germany.
 * 🇩🇪 August 1, 1936: The first Rugby Union Nations Cup begins at the Summer Olympics.
 * 🇩🇪 August 15, 1936: Italy wins their second Olympic gold medal by defeating Hungary in the final by a score of 1-0.
 * 🇦🇷 December 27, 1936: The 1937 South American Championship begins in Argentina as this is the first time that the competition has expanded beyond five teams.
 * 🇮🇹 January 26, 1937: Italy wins the final WEFF Championship over Switzerland at home.
 * August 17, 1937: Dutch East Indies become the first team from Asia to qualify through to the World Cup.
 * February 12, 1938: Latvia cause a massive upset in the 1938 World Ice Hockey Championships when they defeated the United States by a single goal.
 * 🇦🇺 February 13, 1938: Scotland wins their third British Empire Games football gold medal in a row after defeating England 3-2 in the final. This was the last tournament to see a full strength independent British teams competing in football.
 * February 20, 1938: Germany wins the 1938 World Ice Hockey Championships as they defeated Canada in the final.
 * 🇵🇦 February 23, 1938: Costa Rica surprises Central America by finishing with the gold medal in the Central American and Caribbean Games beating Mexico by goal difference.
 * 🇦🇷 May 14-29, 1938: The 1938 FIFA World Cup is held in Argentina.
 * 🇦🇷 May 29, 1938: Italy becomes the first team to win two consecutive FIFA World Cups after they defeat the Netherlands in the final 2-0.
 * 🇨🇴 August 19, 1938: The first football tournament at the Bolivarian Games is held in Bogota, Colombia with Peru taking the gold medal.
 * 🇪🇸 April 1, 1939: The Spanish Civil War ends in a Nationalist victory.
 * September 1, 1939: World War II starts

1940s

 * May 18, 1941: Costa Rica wins the first CCCF Championship at their home country as they won all four matches.
 * January 31, 1942: Argentina wins the first Pan American Championship after defeating Uruguay in the final match.
 * 🇦🇷 February 25, 1945: Chile once again finishes in 4th place for the fifth time in a row at the while Argentina takes home the title.
 * September 2, 1945: World War II ends
 * March 4, 1946: The Victory International Cup starts in Switzerland.
 * March 21, 1946: The Victory International Cup ends with France taking home the international cup as they defeated Yugoslavia in the final.
 * 🇮🇹 September 1, 1946: The first race under Formula A regulations (later to be known as Formula One) is held in Turin.
 * 🇨🇴 December 21, 1946: Colombia is the first host team to win at the Central American and Caribbean Games as they finished ahead of Venezeuela by goal difference.
 * May 4, 1947: Chile becomes the first team to win a qualifier to the 1947 South American Championship after they defeated Bolivia at home.
 * June 15, 1947: In a popular vote, it was decided that the FIFA World Cup would be expanded to twenty teams to encourage more nations to compete at the top level. This was the same day that Sweden won the hosting rights for the 1950 FIFA World Cup and Chile winning hosting rights for the 1954 FIFA World Cup
 * 🇬🇧 October 22, 1947: The British FA is formed after the success of the "match of the century" and the Victory International Cup led to a merge of England, Wales and Northern Ireland.
 * January 25, 1948: The Ice Hockey competition at the 1948 Winter Olympics is cancelled after the Ligue Internationale de Hockey sur Glace boycotted the Olympics after two American teams were sent to St Moritz.
 * February 11, 1948: The first South American Championship of Champions is held in Santiago, Chile with was the first continental club competition.
 * 🇬🇧 April 17, 1948: The first FIFA Youth Tournament comes to a close in Great Britain with the hosts defeating Italy in the final.
 * 🇬🇧 July 29-August 14, 1948: The 1948 Summer Olympics is held in London.
 * 🇬🇧 August 13, 1948: Sweden takes out the gold medal after defeating Yugoslavia 2-1 in the final at Wembley.
 * 🇧🇷 May 5, 1949: Paraguay take home their first South American Championship after they defeated Brazil in the final match of the tournament.
 * September 18, 1949: The first FIVB Volleyball Men's World Championship ends in Czechoslovakia with the Soviet Union taking it out by winning all of their matches in the final round.

1950s

 * More will be added