The 20th century
24,011 sourced entries across 100 documented years, grouped into 10 decades. A century here runs 1900–1999 rather than 1901–2000, so its decades sit inside it exactly; on the BC side the same rule puts 1–99 BC in the 1st century BC and 100 BC in the 2nd.
Decades
- The 1900s — 10 years, 1,976 entries
- The 1910s — 10 years, 2,198 entries
- The 1920s — 10 years, 2,172 entries
- The 1930s — 10 years, 2,174 entries
- The 1940s — 10 years, 2,668 entries
- The 1950s — 10 years, 2,423 entries
- The 1960s — 10 years, 2,735 entries
- The 1970s — 10 years, 2,680 entries
- The 1980s — 10 years, 2,496 entries
- The 1990s — 10 years, 2,489 entries
By subject
- Geopolitics & Diplomacy in the 20th century — 2,872 entries
- Conflict & Security in the 20th century — 2,789 entries
- Culture & Society in the 20th century — 2,159 entries
- Technology & Infrastructure in the 20th century — 1,909 entries
- Disasters & Accidents in the 20th century — 1,798 entries
- Science & Discovery in the 20th century — 1,642 entries
- Crime & Justice in the 20th century — 1,513 entries
- Climate & Environment in the 20th century — 1,309 entries
- Economy & Finance in the 20th century — 1,171 entries
- Health & Medicine in the 20th century — 1,166 entries
- Exploration & Expansion in the 20th century — 1,141 entries
- Religion & Belief in the 20th century — 1,109 entries
A few of the years
- 190014 May – 28 October – The 1900 Summer Olympics takes place in Paris, France. Germany finishes seventh in the overall medal table with four gold medals, two silver and two bronze.
- 1912May 5 – The 1912 Summer Olympics open in Stockholm, Sweden. Modern Pentathlon is contested for the first time in these games.
- 1924March 3 – The Ottoman Caliphate, a remnant of the Ottoman Empire abolished on November 1, 1922, and one of the historical claims of succession to the Islamic State of Muhammad, comes to an end with the deposition of Abdülmecid II, Caliph of the Ottoman dynasty. This marks the end of an era, giving way to the drastic political transformations of Turkey under President Atatürk's reforms.
- 1936January 20 – The Prince of Wales succeeds to the throne of the United Kingdom as King Edward VIII, following the death of his father, George V, at Sandringham House.
- 1948January 12 – Mahatma Gandhi begins his fast-unto-death in Delhi, to stop communal violence during the Partition of India.
- 1960March 21 – The Sharpeville massacre in South Africa results in more than 69 black protesters shot dead by police, 300 injured.
- 1972February 21–28 – U.S. President Richard Nixon makes an unprecedented 8-day visit to the People's Republic of China and meets with Mao Zedong.
- 1984July 28–August 12 – The 1984 Summer Olympics are held in Los Angeles, California.