Decades: 1900s · 1910s · 1920s · 1930s · 1940s · 1950s · 1960s · 1970s · 1980s · 1990s years
The 20th century is the period from January 1, 1901 to December 31, 2000. The 20th century can be seen as an era of health, social, scientific and technical development, as well as international unification, but at the same time it can also be marked as an era of unprecedented wars and genocides. In the 19th century, the mechanization of production and services began, as well as the construction of global communication networks, which continued at an ever-accelerating pace in the 20th century. In this century, in fact, all areas of life changed and the entire human society was fundamentally transformed.
In history, the short term 20th century is used to denote the period from the First World War (1914–1918) and the peace treaties that ended it (1919–1920) to the dissolution of the socialist party led by the Soviet Union (1989–1991).
See also: 2nd millennium, New Age
Events in II. until the end of World War
Main political, economic and natural events of II. until the end of WWII:
Events after WWII
The six most destructive wars and mass murders of the 20th century
II. World War II, Adolf Hitler's rule and the Holocaust (1937–1945), approx. 75 million dead.
Mao Zedong's rule in China (1949–1976), more than 48 million dead.
Chinese Civil War (1925–1948), over 40 million dead.
Stalin's rule (1924–1953), at least 20 million dead
World War I (1914–1918), more than 15 million dead.
Russian Civil War (1917–1921), more than 8.5 million dead.
The greatest acts of the 20th century in defense of peace and life
Mahatma Gandhi's non-violence movement, the peaceful liberation of India in the 40s.
1979: The result of the World Health Organization's international vaccination campaign: the final eradication of smallpox on Earth.
1994: Peaceful victory of Nelson Mandela's movement in South Africa, after decades of non-violent struggle.
1978–2005: II. More than a hundred journeys of Pope John Paul II against wars and poverty and for reconciliation between religions.
In Hungary: the life-saving struggle of Raoul Wallenberg and several other diplomats in Budapest, World War II. in the hell of WWII, approx. Saving 200,000 people
Science and Technology
A significant development took place in the foundations of physics: the theory of relativity and quantum mechanics were born. These led to the development of the atomic bomb, nuclear power, semiconductors and the laser, among others.
Significant progress was made in the research of the smallest components of matter: the structure of the atomic nucleus was discovered, and then the quark structure of nucleons.
With the development of heavier-than-air flying devices, the airplane and jet propulsion, the world became "smaller". Spaceflight has increased our knowledge of Earth and the rest of the world, and has enabled instant communication by Earth-controlled satellites.
In the field of astronomy, the theory of the big bang (cosmology) was developed.
Microelectronics (from the discovery of the transistor to the integrated circuit) has enabled the rapid development of mass communication, telecommunications, and all kinds of intelligent applications. These tools began to be widely used in natural sciences, for example in physics they used the ever-increasing computing capabilities (supercomputer).
In molecular biology, the chemical number of DNA was discovered