More like United As One

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FootfallNovel
Larry Niven & Jerry Pournellestandalone novel1985
Alien invasion and first contact, set in north america.
“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
The Andromeda StrainSeries
series2 books1969
About plague and pandemic.
“Daniel H. Wilson's authorized 2019 sequel The Andromeda Evolution revisits the same threat five decades later.”
from the catalogue
Start with The Andromeda Strain →
The Kraken WakesNovel
John Wyndhamstandalone novel1953
Alien invasion, dark in tone, set in mid 20th century and at sea.
“Earth's life is disrupted by the attacks of extraterrestrials whose war machines, emerging from the depths of the oceans, seem indestructible.”
from the catalogue
The Apocalypse TrollNovel
David Weberstandalone novel1999
Time travel and alien invasion.
The WandererNovel
Fritz Leiberstandalone novel1964
Set in space.
TripodsSeries
series4 books1967
completed
Post-apocalyptic and alien invasion, about rebellion and revolution, set in near future.
“The first two books were the basis of a science fiction TV series, produced in the United Kingdom in the 1980s.”
from the catalogue
Start with When the Tripods Came →