The era of Prohibition is over, thanks to years of campaigning by the public, breweries and business people. The national ban on liquor consumption began in 1920 with the ratification of the 18th Amendment. It ended with ratification of the 21st Amendment in 1932. But during those 12 years, public protests escalated. Consumption didn't drop; it was merely hidden inside "speakeasies."
Finally, it was the desire to boost tax revenue that convinced Congress to repeal the law — something even the most anti-liquor legislators would support as the Depression took hold.
See a newsreel announcing the end of Prohibition.