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 1921 - Charles Strite of Minnesota patents the pop-up toaster.

1921 - December 29 - William Lyon Mackenzie King becomes Prime Minister of Canada

 1923 to 1927 - Television is invented (Vladimir Kosma Zworykin (Russia), Philo Taylor Farnsworth (United States))

1926 - June 29 - Arthur Meighen becomes Prime Minister of Canada

1926 - September 25 - William Lyon Mackenzie King becomes Prime Minister of Canada

 1927 - The aerosol can is invented (Erik Rotheim, Norway)

 1928 - Sliced bread (bread slicing machine) is invented by Otto Frederick Rohwedder (United States)

 1930 - Scotch tape is invented (Richard Drew (3M), United States)

 In 1930, on February 18, Pluto was discovered by astronomer Clyde Tombaugh at the Lowell Observatory in Flagstaff, Arizona, marking a significant milestone in the study of our solar system.

1930 - August 7 - R. B. Bennett becomes Prime Minister of Canada

 1931 - The paper towel is invented (Arthur Scott, United States)

 1934 - The metal beverage can is invented (American Can Co., United States)

 1935 - The snowmobile was invented by Joseph Bombardier (Quebec, Canada)

1935 - October 23 - William Lyon Mackenzie King becomes Prime Minister of Canada

1936 - January 20 - Edward VIII becomes King of England

1936 - December 11 - George VI becomes King of England

 1938 - The ballpoint pen is invented (Lazlo Biro, Hungary)

 1938-1944 - Sunscreen is invented (Franz Greiter, Switzerland and Benjamin Green, United States)

 1938 - October 27 - Du Pont announces a name for its new synthetic yarn: nylon.

 1940 - April - 1st electron microscope demonstrated (RCA), Philadelphia, Pennsylvania, USA

 1945 - The atomic bomb is invented (J. Robert Oppenheimer, et al., United States)

 The microwave oven was invented accidentally in 1945 by Percy Spencer, a Raytheon engineer. While testing a magnetron, he noticed microwaves melted a candy bar in his pocket. Experimenting further, he discovered microwaves could cook food quickly. Raytheon patented the process, and by 1947, they built the first commercial microwave oven, called the 'Radarange.' Initially used in commercial settings, microwaves becomes affordable for home use by the 1960s and 1970s, revolutionizing cooking.

 1948 - Velcro is invented (George de Mestral, Switzerland)

1948 - November 15 - Louis St. Laurent becomes Prime Minister of Canada

1952 - February 6 - Elizabeth II becomes Queen of England

1957 - June 21 - John Diefenbaker becomes Prime Minister of Canada

1963 - April 22 - Lester B. Pearson becomes Prime Minister of Canada

 1968 - The ATM is invented (Don Wetzel, United States)

1968 - April 20 - Pierre Trudeau becomes Prime Minister of Canada

 The cell phone was invented by Martin Cooper of Motorola. On April 3, 1973, he made the first handheld mobile phone call with the Motorola DynaTAC. This device weighed 2.5 pounds and was 10 inches long, offering 30 minutes of talk time and requiring 10 hours to charge. The first commercial cell phone was released in 1983, revolutionizing communication and leading to the modern smartphones we use today.

1979 - June 4 - Joe Clark becomes Prime Minister of Canada

1980 - March 3 - Pierre Trudeau becomes Prime Minister of Canada

1981 - June 5 - First reported case of AIDS (Acquired Immune Deficiency Syndrome)

 1982 - The camcorder is invented (Sony Corp., Japan)

 1983 - The laptop computer is invented (Radio Shack Corp., United States)

1984 - June 30 - John Turner becomes Prime Minister of Canada

1984 - September 17 - Brian Mulroney becomes Prime Minister of Canada

 1989 - The World Wide Web is invented at CERN (Tim Berners-Lee, UK)

1993 - June 25 - Kim Campbell becomes Prime Minister of Canada

1993 - November 4 - Jean Chrétien becomes Prime Minister of Canada