The 20th century lasted from 1901 to 2000 in the Gregorian calendar. Common usage sometimes regards it as lasting from 1900 to 1999. The 20th century is also sometimes known as the nineteen hundreds (1900s).
However, a number of arguments have been used to justify the common usage. One advanced by Stephen Jay Gould is that the first decade had only nine years, thus contradicting the definition of decade equaled 10 years. Another argument is that the astronomical year numbering system for years does have a year zero, the year normally known as 1 BC. In 2000 the International Organization for Standardization clarified ISO 8601 to use the astronomical year numbering system, which could be interpreted as retrospectively endorsing all the people who had celebrated the new century. Also, decades are almost always considered as starting with the "0" year and named accordingly ("1960s", etc.).
The term is also used to describe various periods that overlap with the calendar definition, most notably the Short twentieth century, which claims that the 20th Century spanned from 1914 to 1989, rendering the pre-WWI 1900s into the 19th Century and putting the 1990s at the beginning of the 21st Century.
Indeed, the part of the 20th Century before World War I is quite identical to the late 1800s culturally and technologically and the 1990s decade pointed in many ways (such as the rise of the Internet) to the 21st Century and is seen by some as not being truly a part of the 20th Century.
Overview
The twentieth century saw a remarkable shift in the way that vast numbers of people lived, as a result of technological, medical, social, ideological, and political innovations. Terms like ideology, world war, genocide, and nuclear war entered common usage and became an influence on the lives of everyday people. War reached an unprecedented scale and level of sophistication; in the Second World War (1939-1945) alone, approximately 57 million people died, mainly due to massive improvements in weaponry. The trends of mechanization of goods and services and networks of global communication, which were begun in the 19th century, continued at an ever-increasing pace in the 20th. In spite of the terror and chaos, the 20th century saw many attempts at world peace. As the 35th President of the United States John F. Kennedy said:
- What kind of peace do we seek? I am talking about a genuine peace, the kind of peace that makes life on earth worth living. Not merely peace in our time, but peace in all time. Our problems are man-made, therefore they can be solved by man. For in the final analysis, our most basic common link is that we all inhabit this small planet, we all breathe the same air, we all cherish our children's future, and we are all mortal.
Virtually every aspect of life in virtually every human society changed in some fundamental way or another during the twentieth century and for the first time, any individual could influence the course of history no matter their background. Arguably, the 20th century re-shaped the face of the planet in more ways than any previous century.
Scientific discoveries such as relativity and quantum physics radically changed the worldview of scientists, causing them to realize that the universe was much more complex than they had previously believed, and dashing the hopes at the end of the preceding century that the last few details of knowledge were about to be filled in.
For a more coherent overview of the historical events of the century, see The 20th century in review.
The 20th century has sometimes been called, both within and outside the United States, the American Century, though this is a controversial term.
Important developments, events and achievements
Science and technology
- The assembly line and mass production of motor vehicles and other goods allowed manufacturers to produce more and cheaper products. This allowed the automobile to become the most important means of transportation.
- The invention of heavier-than-air flying machines and the jet engine allowed for the world to become "smaller". Space flight increased knowledge of the rest of the universe and allowed for global real-time communications via geosynchronous satellites.
- Mass media technologies such as film, radio, and television allow the communication of political messages and entertainment with unprecedented impact
- Mass availability of the telephone and later, the computer, especially through the Internet, provides people with new opportunities for near-instantaneous communication
- Applied electronics, notably in its miniaturized form as integrated circuits, made possible the above mentioned rise of mass media, telecommunications, ubiquitous computing, and all kinds of "intelligent" appliances; as well as many advances in natural sciences such as physics, by the use of exponentially growing calculation power (see supercomputer).
- The development of Nitrogen fertilizer, pesticides and herbicides resulted in significantly higher agricultural yield.
- Advances in fundamental physics through the theory of relativity and quantum mechanics led to the development of nuclear weapons (known informally as "the Bomb" and dropped on the industrial town of Hiroshima and the historic one of Nagasaki), the nuclear reactor, and the laser. Fusion power was studied extensively but remained an experimental technology at the end of the century.
- Inventions such as the washing machine and air conditioning led to an increase in both the quantity and quality of leisure time for the middle class in Western societies.
- Most influential inventions in the 20th century: antibiotics, oral contraceptives, new plastics, transistors, Internet
- More...
Wars and politics
- Democratic nations began to extend voting privileges to all adults.
- Rising nationalism and increasing national awareness were among the causes of World War I, the first of two wars to involve all the major world powers including Germany, France, Italy, Japan, the United States and the British Commonwealth. World War I led to the creation of many new countries, especially in Eastern Europe. Ironically, it was said by many to be the 'War to end all Wars'.
- The economic and political aftermath of World War I led to the rise of Fascism and Nazism in Europe, and shortly to World War II. This war also involved Asia and the Pacific, in the form of Japanese aggression against China and the United States. While the First World War mainly cost lives among soldiers, civilians suffered greatly in the Second -- from the bombing of cities on both sides, and in the unprecedented German genocide of the Jews and others, known as the Holocaust.
- During World War I, in Russia the Bolshevik putsch led to the Russian Revolution of 1917. After the Soviet Union's involvement in World War II, Communism became a major force in global politics, spreading all over the world: notably, to Eastern Europe, China, Indochina and Cuba. This led to the Cold War and proxy wars with the western world, including wars in Korea (1950-53) and Vietnam (1957 - 75).
- The "fall of Communism" in the late 1980s freed Eastern and Central Europe from Soviet supremacy. It also led to the dissolution of the Soviet Union and Yugoslavia into successor states, many rife with ethnic nationalism, and left the United States as the world's superpower.
- Through the League of Nations and, after World War II, the United Nations, international cooperation increased. Other efforts included the formation of the European Union, leading to a common currency in much of Western Europe, the euro around the turn of the millennium.
- The end of colonialism led to the independence of many African and Asian countries. During the Cold War, many of these aligned with the USA, the USSR, or China for defense.
- The creation of Israel, a Jewish state in a mostly Arab region of the world, fueled many conflicts in the region, which were also influenced by the vast oil fields in many of the Arab countries.
- The term Southeast Asia coined.
Culture and entertainment
- Movies, music and the media had a major influence on fashion and trends in all aspects of life. As many movies and music originate from the United States, American culture spread rapidly over the world.
- After gaining political rights in the United States and much of Europe in the first part of the century, and with the advent of new birth control techniques women became more independent throughout the century.
- Rock and Roll and Jazz styles of music are developed in the United States, and quickly become the dominant forms of popular music in America, and later, the world. The Beatles, a 1960s British Rock and Roll band, becomes one of the most successful acts of all time, and is credited, in their experimental later albums, with permanently changing what was thought possible in popular music.
- Modern art developed new styles such as expressionism, cubism, and surrealism.
- The automobile provided vastly increased transportation capabilities for the average member of Western societies in the early to mid-century, spreading even further later on. City design throughout most of the West became focused on transport via car. The car became a leading symbol of modern society, with styles of car suited to and symbolic of particular lifestyles.
- Sports became an important part of society, becoming an activity not only for the privileged. Watching sports, later also on television, became a popular activity.
Disease and medicine
Natural resources and the environment
- The widespread use of petroleum in industry -- both as a chemical precursor to plastics and as a fuel for the automobile and airplane -- led to the vital geopolitical importance of petroleum resources. The Middle East, home to many of the world's oil deposits, became a center of geopolitical and military tension throughout the latter half of the century. (For example, oil was a factor in Japan's decision to go to war against the United States in 1941, and the oil cartel, OPEC, used an oil embargo of sorts in the wake of the Yom Kippur War in the 1970s).
- A vast increase in fossil fuel consumption leads to depletion of natural resources, while air pollution has led to the develoment of an ozone hole and, many believe, global warming and both local and global climate change. The problem is increased by world-wide deforestation, also causing a loss of biodiversity. The problem of a depletion of natural resources is decreased by advances in drilling technology which led to a net increase in the amount of fossil fuel that is readily obtainable at the end of the century, as compared with the amount considered obtainable at the beginning of the century.
Significant people
World leaders
- Africa
- Gnassingbe Eyadema, Togo
- Félix Houphouët-Boigny, Côte d'Ivoire
- Kenneth Kaunda, Zambia
- Jomo Kenyatta, Kenya
- Idi Amin, Uganda
- Nelson Mandela, South Africa
- Robert Mugabe, Zimbabwe
- Gamal Abdal Nasser, Egypt
- Kwame Nkrumah, Ghana
- Julius Nyerere, Tanzania
- Habib Bourguiba, Tunisia
- Muammar al-Qaddafi, Libya
- Haile Selassie, Ethiopia
- Léopold Sédar Senghor, Senegal
- Ahmed Sékou Touré, Guinea
- Americas
- Juan Perón, Argentina
- Eva Perón, Argentina
- Getúlio Vargas, Brazil
- Luis Carlos Prestes, Brazil
- Juscelino Kubitschek, Brazil
- Wilfrid Laurier, Canada
- William Lyon Mackenzie King, Canada
- Pierre Trudeau, Canada
- Salvador Allende, Chile
- Augusto Pinochet, Chile
- Fidel Castro, Cuba
- Ernesto 'Che' Guevara, Argentina/Cuba
- Emiliano Zápata, Mexico
- Pancho Villa, Mexico
- Lázaro Cárdenas del Río, Mexico
- Augusto César Sandino, Nicaragua
- Fernando Belaúnde Terry, Peru
- Alberto Kenya Fujimori, Peru
- Theodore Roosevelt, USA
- Woodrow Wilson,USA
- Franklin D. Roosevelt, USA
- Harry S Truman, USA
- Dwight Eisenhower, USA
- John F. Kennedy, USA
- Lyndon B. Johnson, USA
- Richard Nixon, USA
- Ronald Reagan, USA
- Bill Clinton, USA
- George H. W. Bush, USA
- José Batlle y Ordóñez, Uruguay
- Romulo Betancourt, Venezuela
- Asia
- Mahatma Gandhi, India
- Lee Kuan Yew, Singapore
- Ferdinand Marcos, the Philippines
- Corazon Aquino, the Philippines
- Mao Zedong, People's Republic of China
- Deng Xiaoping, People's Republic of China
- Pol Pot, Cambodia
- Muhammad Ali Jinnah, Pakistan
- Indira Gandhi, India
- Mahathir Mohamad, Malaysia
- Jawaharlal Nehru, India
- Emperor Hirohito, Japan
- Ho Chi Minh, Vietnam
- Sun Yat-sen, Republic of China
- Chiang Kai-shek, Republic of China
- Achmad Sukarno, Indonesia
- Suharto, Indonesia
- Europe
- Franz Joseph of Austria, Austria-Hungary
- Václav Havel, Czech Republic
- Franjo Tuđman, Croatia
- Archbishop Makarios III, Cyprus
- Urho Kekkonen, Finland
- Philippe Pétain, France
- Charles de Gaulle, France
- Valéry Giscard d'Estaing, France
- François Mitterrand, France
- Kaiser Wilhelm II, Germany
- Friedrich Ebert, Germany
- Adolf Hitler, Germany
- Konrad Adenauer, West Germany
- Walter Ulbricht, East Germany
- Erich Honecker, East Germany
- Willy Brandt, West Germany
- Helmut Kohl, Germany
- Gerhard Schröder, Germany
- Eleftherios Venizelos, Greece
- Ioannis Metaxas, Greece
- Konstantinos Karamanlis, Greece
- Andreas Papandreou, Greece
- Miklós Horthy, Hungary
- Imre Nagy, Hungary
- Benito Mussolini, Italy
- Aldo Moro, Italy
- Eamon de Valera, Ireland
- Einar Gerhardsen, Norway
- Józef Piłsudski, Poland
- Lech Wałęsa, Poland
- António de Oliveira Salazar, Portugal
- Mário Soares, Portugal
- Nicolae Ceauşescu, Romania
- Milan Kučan, Slovenia
- Francisco Franco, Spain
- Felipe González, Spain
- Adolfo Suárez, Spain
- Olof Palme, Sweden
- Mustafa Kemal Atatürk, Turkey
- Neville Chamberlain, United Kingdom
- Winston Churchill, United Kingdom
- Margaret Thatcher, United Kingdom
- Tony Blair, United Kingdom
- Josip Broz Tito,Yugoslavia
- Slobodan Milošević, Yugoslavia
- Middle East
- Reza Shah Pahlavi, Iran
- Mohammad Reza Pahlavi, Iran
- Mohammad Mosaddeq, Iran
- Ayatollah Khomeini, Iran
- Ayatollah Khamenei, Iran
- Mohammad Khatami, Iran
- Abdul Nasser, Egypt or United Arab Republic
- Anwar Sadat, Egypt or United Arab Republic
- David Ben-Gurion, Israel
- Golda Meir, Israel
- Menachem Begin, Israel
- Yitzhak Rabin, Israel
- Hafez el Assad, Syria
- Saddam Hussein, Iraq
- King Hussein, Jordan
- Yassar Arafat, Palestine
Scientists
- Biology and Anthropology
- Chemistry
- Computer Science
- Mathematics
- Medicine and Pharmacy
- Physics and Astronomy
- Psychology
Humanities
Business
Aerospace pioneers
Military leaders
Spiritual figures
Artists