More like The Trinity Paradox

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The War in the AirNovel
H. G. Wellsstandalone novel1908
Military science fiction, set in europe.
A Century of ProgressNovel
Fred Saberhagenstandalone novel1983
Alternate history.
“For centuries two meg-powers from the future have been waging war for control of timelines of history.”
from the catalogue
The Guns of the SouthNovel
Harry Turtledovestandalone novel1992
Alternate history and war & military, set in 19th century.
Worldwar UniverseSeries
series8 books1994
Alternate history and alien invasion, about aliens.
Start with In the Balance →
FoundationUniverse
universe123 books1940
About robots, set in far future.
“There is a science that reads the future of quadrillions the way an astronomer reads the orbits of stars.”
from the catalogue
Start with Foundation →
includes The Collected Fiction of Isaac Asimov, Trantorian Empire, Foundation, Second Foundation Trilogy, The Positronic Robot Stories, Foundation (Original Stories)
FootfallNovel
Larry Niven & Jerry Pournellestandalone novel1985
Alien invasion and first contact, about aliens, set in contemporary.
“When aliens travel to Earth from Alpha Centauri, differences between alien and human psychology result in an unprovoked invasion, and the resulting resistance results in the aliens' use of a devastating weapon.”
from the catalogue