Why is World War 1 considered a major turning point in history?
It began with a simple boycott of Jewish shops and ended in the gas chambers at Auschwitz as Adolf Hitler and his Nazi followers attempted to exterminate the entire Jewish population of Europe. For some is seen as a major event, not as a turning-point. For others the Holocaust was a turning point in history, which prompted the world to say "never again".
A major battle during World War II, Stalingrad (August 1942 to February 1943) is considered to be one of the war's major turning-points for several reasons. For one thing, it resulted in the destruction of a massive German army. For another thing, and much more importantly, it demonstrated that the Soviet military had improved its tactics, logistics, and strategy to such an extent that it was now a match for its German opponent.