World wars are scourges in human history, and every world war is caused by an uneven distribution of resources and, more strictly, by human greed. Of course, the occurrence of a world war is not completely beneficial, although the First World War brought deep disasters to mankind, but also objectively promoted the development of science and technology, aircraft, tanks, poison gas have been put into the battlefield, in the critical moment of survival, human creativity has once again been stimulated.
At the end of the 19th century and the beginning of the 20s, the imperialist countries waged a very fierce struggle for world hegemony and colonies. At that time, there were three major contradictions in the world: the Franco-German contradiction, the Russian-Austrian contradiction, and the Anglo-German contradiction. After the defeat of the Franco-Prussian War, France lost its previous hegemony in Europe, and the mood of "revenge" in the country was high, and Germany was already trying to expand its armaments for the upcoming war in order to prevent France from making a comeback
Britain, however, was a relatively "neutral" country, unwilling to see Germany too strong or to see Russia expand into Europe. Therefore, Britain simply intensified the contradictions by the dispute with Germany on the colonial issue, forcing Germany to take the lead in the war. In 1879, under the impetus of Bismarck, Germany and Austria signed the "Treaty of Alliance", and soon after, Italy also lost the struggle with France, just as the so-called "enemy of the enemy is a friend", so in 1882, Germany, Austria and Italy formally signed the "Treaty of Alliance", and the First World War began.
After some fighting, the German side was defeated, and they had to accept the reality and sign a huge compensation agreement. World War I lasted four years and affected more than 30 countries, involving 1.5 billion people in the war and causing up to 30 million casualties. At the same time, the world economy has also been seriously damaged and it is difficult to recover in a short period of time. In 1929, the U.S. stock market collapsed, and an economic crisis swept through the capitalist world.
At that time, Germany still did not come out of the shadow of defeat, and in order to repay its debts, the living standards of its citizens had already plummeted. Just as the so-called "hero of the times" is called", although Hitler is not a hero who is praised by everyone, he is a person who stirs up the storm, his unwillingness, coupled with the expansion of Japan's ambitions, and the addition of old ally Italy, the three sides hit it off immediately, and soon set off another bloody storm.
Unexpectedly, the United States quietly developed atomic bombs for decades, and with the outbreak of two atomic bombs, World War II was also declared over. As we all know, the birth of the atomic bomb has a certain relationship with Einstein, and it can be said that he can clearly foresee the direction of future wars, especially in the field of weapons and equipment. On this subject, he once said: "I don't know what the Third World War will be like, but the weapons used in the Fourth World War must be stones and sticks."
In fact, Einstein's words are very profound, today's scientific and technological development is too fast, human beings have achieved the heavens, the sea, into the earth, and even the outer space has left footprints. Perhaps in the battlefields of the Third World War, more advanced and crazy weapons will appear, but at the same time, the survival of humanity is also seriously threatened. Human beings, in pain, are likely to adopt the most primitive stones and sticks, because by then there is no contradiction that cannot be sat down and discussed.