The world war is a catastrophe of human civilization, and thousands of people have been killed in the world war, causing unprecedented and huge losses to human material and spiritual civilization. The First World War occurred at the end of the 19th century and the beginning of the 20th century, during the transition from the capitalist countries to imperialism, the main imperialist countries arose a huge contradiction between the major imperialist countries over the distribution of world interests, which led to the world war, which was an unjust war between imperialism, in order to redivide the world and compete for global hegemony. The war lasted for more than four years, involving more than 30 countries and 1.5 billion people, 65 million people, more than 10 million people killed and more than 20 million wounded. Various new weapons were brought to the stage of war, such as heavy artillery, aircraft, poison gas, tanks, killing a large number of soldiers.
The Second World War was triggered by an economic crisis within capitalism. This war is bigger and more destructive than the last. In the war, more than 70 million people died and 130 million were injured in the war, which was the largest world war in human history. And at the end of World War II, nuclear weapons officially entered the stage of history.
After the end of World War II, the United Nations was established, and two super empires of the United States and the Soviet Union appeared, the United States and the Soviet Union competed for hegemony, the two sides frantically expanded their armaments, and produced and deployed a large number of nuclear weapons, which were enough to destroy the world more than 20 times, and the whole world was shrouded in the danger of destruction. In this confrontation, the Soviet Union, a behemoth, finally disintegrated, and the United States became the only transcendent power in the world, and began to act as the "world policeman" to maintain world peace everywhere.
Although most of the countries were involved in the two world wars, there were still a few countries that were very safe, such as Switzerland, which were permanently neutral, and these countries were not defended or even had armies, and their strategic positions were not important, so neither side of the belligerents fought these countries. If World War III breaks out, which part of the world is the safest? Einstein once made a very classic speech, which can be called a prophecy of God. "I don't know what weapons were used in the Third World War, but I know that the weapons used for the fourth time must be sticks and stones"
At the end of the Second World War, human beings have used nuclear weapons, if the third world war breaks out, there will be more powerful nuclear weapons, when both sides use nuclear weapons, there is no safe place in the world, and mankind will be destroyed in this nuclear war. When the new human race began the Fourth World War again, the weapons used were stone and wooden sticks.