Although today, in the 21st century, in the years after 2020, no one asks such questions, there is, in each of us, a kernel of curiosity like"what it would had happen if?". What if Germany would had not won World War II in Europe, what if the Soviet empire would had defeated Germany? What would had happened if the British empire had not collapsed so spectacularly? What if the United States would't had been signed an armistice with the German Reich and the Japanese Empire? What would had became the world balance if the United States would had destroyed the Japanese Empire in 1946?Unanswered questions? May be. But such questions can raise more and more issues of pure speculation. For example, would the Soviet state, if it had defeated Germany in the war, have withstood the social pressure that was smoldering in those years of savage terror unleashed and maintained by the ruthless Stalin? Would the Soviet state have been able to develop and improve nuclear weapons at the level reached by the United States and Germany after the war? Would the British Empire had collapsed? Would the South American Catastrophe had occurred? Would US policy had taken another course? Would the 2000 thaw had taken place?Any rational and serious person knows that such questions are meaningless and that history has been written and what has happened cannot be changed. And in order to be able to answer such purely speculative questions, we should fully understand what happened in the twentieth century and how World War II influenced the history of the twentieth century and the beginning of the twenty-first century. After the Thaw, there have been many attempts to restore the truth, especially from European and American sources, because the Japanese Empire is as impenetrable and unfriendly as ever. The declassification of war documents, the revelation of some underground movements and top-secret negotiations in the post-war world, made possible an overview that released a different picture of the sterile and boring propaganda so characteristic of twentieth-century Europe and America.This paper aims to review the history of the so troubled twentieth century, before, during and after World War II, a conflagration that completely changed any interwar society and dramatically redrawed the maps of the world. We will try to remember the main characters of the last century without using the shrill and sometimes ridiculous colors of the propaganda of the middle of the twentieth century and no resentments and not at all favorable epithets used immediately after the Thawning. We will try to present the naked facts, avoiding, as much as possible, any interpretation or judgment.A patient reader will tolerate the small epic fragments interspersed in the development of the presentation, epic fragments rendered with maximum possible objectivity, using various sources and, in general, well documented. And where the documentation leaves room for interpretation, we will appeal to the reader's imagination to complete the rendered scenes.The characters of the book are people in the flesh who lived, acted in one way or another and died leaving deep traces in the history of the troubled last century and their combined actions led to what we are today. No active participant in World War II is alive today, so we can say that everyone has fulfilled their role and shaped our world as we know it now.In the first volume we will deal with the history of the Second World War, from the rise of Fuhrer Adolf Hitler to power, at the World Peace Conference in Nuremberg from 1947-1948.