ocr: Gamous Dates in BEER History - - - 1920 Prohibition begins. Prohibition begins, BUT,of the thousands of pre- 1933 prohibition brewers, only 750 reopen. 1935 Beer can is developed. - - - - : - L 1964 Low calorie light beers developed in U.S. ? 1979 Homebrewing legalized. Microbreweries begin commercial operation; 1980 offer better quality than big brewers.