What event in history did m and m's become an official candy?

M&M's were officially introduced to the market in 1941. They were created by Forrest Mars and Bruce Murrie, the son of the founders of Mars Company and Hershey Chocolate, respectively. The candy gained popularity during World War II as they were easy to transport and did not melt, making them a favored treat among soldiers. M&M's have since become one of the most iconic candies worldwide.