H. G. Wells' book
Things To Come, published in 1933, accurately predicted the beginning of WWII in 1940, with involvement by all the major countries of the world. (In that book he also predicted air raids on England, gas warfare, air conditioning, commercial televivion, and videotape recording.)
Hugo Gernsback's book
RALPH 124C 41+, published in 1925, predicted:
- Television
- Wireless power transmission
- Televised phone calls
- Transcontinental air service
- Scientific research funded by the U.S. government
- Photographs transmitted by radio
- Sliding doors that are automatically controlled
- Solar cells and energy in practical use
- Sound movies
- Mass transmission of entertainment programs to the home
- Practical use of Earth's heat to produce steam
- Synthetic milk and foods
- Artificial cloth
- Voiceprints used for identification
- Tape recorders and recordings
- Spaceflight