What influence has war brought to human history and social development in history?

Promote the development of human military science and culture. Although the war brought disasters to many people, many inventions and creations were born in the war, which brought a lot of convenience to people. Just as gunpowder was developed in the war, today's various equipment and weapons came into being. After the war, the country was unified, the people were able to live and work in peace and contentment, politics was enlightened, and people from all over the world could exchange and learn, which greatly promoted the development of culture. There will be wars, there will be fights, there will be killings, and there will be China today. If it weren't for the deprivation of other countries, we might still be in the closed-door Qing Dynasty.