The 1920's was, for 8 years and 3/4 of 1929, a very happy decade. The last 1/4 was the Stock Market Crash that could have started the Great Depression that lasted straight through the 1930' s, not ending until mid-1940. A war started before 1920, and a war broke out in 1929. Although it was called the Great Depression, people killed others, killed themselves, became homeless, and became penniless. Actually, the eight years of happiness might have felt like a small vacation to a person who lived during the time.