The first rocket in space was a turning point in history because it inspired the space race, made the United States aware of the possibility of Russia creating rockets to deliver nuclear weapons, and created a reform in education.
The steam boat
The cotton gin and others
They died from cold,starvation and diseases such as influenza.
If this is refering to the Second World War, regardless the creation of the German Bizmark, Hitlers “new deal” program was to restart the German economy. While it did contribute tension between the great powers in Europe, Hitler had youth traning programs and engineered tanks that were far superior than what France and the British had. There was and agreement between the European powers that limited naval guns to less than 13mm (which Germany spat on by equipping the Bizmark with 15mm), to reduce world tension.