The Great War transformed the world drastically with the adoption of a new mode of warfare based on modern weapons of mass destruction. They used machine guns, tanks, aircraft,chemical weapons, etc. on a mass scale. The number of deaths reached up to 9 million and of the injured reached upto 20 million at the end of the war. Most of the victims belonged to young generations or the workforce. As a result, it reduced the workforce in Europe, thereby reducing household income. Economic transformation was in the form of shift in investment and capital distribution. The wartime situations encouraged production of war-related goods. Society also reorganised to meet wartime challenges, such as the increasing role played by women in areas previously predominated by men. Politically, the war also brought new allies and new enemies between powerful countries. The war in Europe transformed the US from being an international debtor to international creditor.Russian revolution of 1917 also affected global relations when the first communist government was established under the leadership of Vladimir Lenin. Colonies changed hands while some new nations emerged.