1900
- May 24
- 34th Belmont Stakes: Nash Turner aboard Ildrim wins in 2:21.25. [1]
1901
- March 15
- Horse racing is banned in San Francisco, last race March 16th. [1]
- May 23
- 35th Belmont Stakes: H Spencer aboard Commando wins in 2:21. [1]
1902
- (month unknown)
- Belgium makes new casinos illegal, allowing eight existing casinos to remain. [80.331]
1903
- May 27
- 37th Belmont Stakes: John Bullman aboard Africander wins in 2:21.75. [1]
- (month unknown)
- Luxembourg law forbids all kinds of gambling. [80.340]
1904
- May 25
- 38th Belmont Stakes: George Odom aboard Delhi wins in 2:06.6. [1]
1905
- May 24
- 39th Belmont Stakes: Eugene Hildebrand aboard Tanya wins in 2:08. [1]
1906
- February 28
- Birth of Bugsy Siegel gangster created casinos in Las Vegas. [1]
- May 30
- 40th Belmont Stakes: Lucien Lyne aboard Burgomaster wins in 2:20. [1]
- (month unknown)
- Kentucky, USA, legalizes pari-mutuel betting at racetracks. [86.164]
1907
- May 30
- 41st Belmont Stakes: G Mountain aboard Peter Pan wins. [1]
- (month unknown)
- French law allows baccarat and chem-de-fer games. [80.291]
1908
- May 30
- 42nd Belmont Stakes: Joe Notter aboard Colin wins. [1]
1910
- May 30
- 44th Belmont Stakes: James Butwell aboard Sweep wins in 2:22. [1]
- (month unknown)
- Herbert Mills produces the Operators Bell slot machine, based on Charles Fey's Liberty Bell, but with 20 symbols per reel, and a window showing three rows. [87.205]
1911
- (month unknown)
- California outlaws slot machines. [39]
1912
- (month unknown)
- Eugene Cornuché founds a casino at Deuville, France. [80.292]
1913
- (month unknown)
- First electronic calculator used in horse racing pari-mutuel betting system. [80.191]
1916
- (month unknown)
- Queensland, Australia, inaugurates the Golden Casket lottery. [80.331]
1918
- March 2
- Birth of Peter O'Sullevan Ireland, horse racing commentator. [1]
- June 15
- 50th running of Belmont Stakes (Johren wins). [1]
1919
- February 5
- National League president John Heydler dismisses charges that Hal Chase bet against his team and threw games in collusion with gamblers. [1]
- June 6
- Man O' War wins first victory as a 2-year-old at Belmont. [1]
- September 9
- Birth of Jimmy "the Greek" Snyder gambler/sportscaster (lay you 5 to 1). [1]
- October 1
- World Series #16 begins as a best of 9 affair, Chicago White Sox intentionally throw this series to satisfy gamblers (The Black Sox Scandal). [1]
1920
- February 22
- In Emeryville, New York, the first dog race track to employ an imitation rabbit opens. [1] [5]
- May 20
- Policemen raid the Chicago Cubs' bleachers and arrest 24 fans for gambling. [1]
- (month unknown)
- Maryland, USA, legalizes racetrack-operated pari-mutuel gambling. [86.155,165]
1924
- (month unknown)
- In England, John Moores creates the world's first public postal soccer pool with credit betting. [80.96]
- Switzerland makes gambling on boule legal. [80.343]
1925
- (month unknown)
- In Chile, a law authorizes the University of Concepción to operate a lottery. [80.333]
1926
- (month unknown)
- Louisiana, USA, legalizes racetrack-operated pari-mutuel gambling. [86.155,165]
1927
- (month unknown)
- Illinois, USA, legalizes racetrack-operated pari-mutuel gambling. [86.155,165]
1928
- (month unknown)
- Chile legalizes public gambling at the Vina del Mar resort near Santiago. [80.333]
- Totalizer betting is made legal in Great Britain. [80.335]
- Russian law forbids all private gambling. [80.343]
- November 4
- Arnold Rothstein is shot and killed in the Park Central Hotel in New York City, owing US$333,000 on a poker game. [80.322]
1929
- December 1
- Game of BINGO invented by Edwin S Lowe. [1]
1930
- (month unknown)
- The Government of the Republic of Eire (Ireland) passes the Public Hospital Act, legalizing a lottery for the benefit of Irish hospitals. [39] [80.245]
- Bolivia makes gambling illegal in mining regions. [80.332]
1931
- March 19
- Nevada legalizes casino gaming and most other forms of gambling. [1] [39] [86.6]
- (month unknown)
- Massachusetts decriminalizes bingo. [39]
- Nevada legalizes gambling. [80.303]
- Florida legalizes pari-mutuel horse and greyhound race betting. [86.165]
- O.D. Jennings introduces the first electrically powered slot machine, called "Electrojax". [87.206]
- July 21
- Reno race track, becomes first in US to use daily double wagering. [1]
1932
- January 14
- Horse racing legend Eddie Arcaro won his first race. [1]
- May 7
- At the Churchill Downs racecourse near Louisville, Kentucky, the 58th Kentucky Derby horse race is held. Eugene James aboard Burgoo King wins in 2:05.2. Total legal betting on the race: US$277,000. [1] [80.186]
1933
- (month unknown)
- Michigan, New Hampshire, Ohio, West Virginia, and California legalize parimutuel betting. [39] [86.165]
- French law allows roulette gambling. [80.291]
- O.D. Jennings produces the "Little Duke" slot machine, with candy vending attachment on the side. [87.206]
1934
- (month unknown)
- In Sweden, a special authority is set up for betting on soccer matches. [80.342]
- Massachusetts and Rhode Island legalize pari-mutuel betting on horse racing. [86.165]
- O.D. Jennings produces the "Duchess Vendor" slot machine, with built-in candy dispenser. [87.206]
1935
- (month unknown)
- Thailand gaming act authorizes gambling enterprizes with government license. [80.343]
- Florida legalizes pari-mutuel jai-alai betting. [86.165]
- Maine, Delaware, and Arkansas legalize pari-mutuel betting on horse racing. [86.165]
- O.D. Jennings introduces "The Chief" slot machine, setting the standard format for the industry for the next 30 years. The machine includes a slug rejector and an anti-overlap coin return device. [87.207]
- October
- New York gangster Dutch Schultz is killed by an unknown gunman. Schultz was head of the numbers racket, seldom paying winners. [80.247]
1936
- (month unknown)
- In Israel, the Criminal Code Ordinance prohibits casinos, gaming houses, and lotteries. [80.338]
1938
- (month unknown)
- Bolivia makes gambling illegal in all of the country. [80.332]
1939
- (month unknown)
- South Africa gambling act declares pin-tables, slot machines, and lotteries illegal. [80.342]
- November
- New York voters approve amending the state constitution to allow pari-mutuel gambling on horse races. [86.165]
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