Games like The American War
Games like The American War include DOOM, Ready or Not, Left 4 Dead 2, Phasmophobia, and Battlefield™ 2042. We matched them by the tags players give The American War on Steam (Action, Horror, Demons, First-Person, and FPS): closest matches first, and among equally close ones the better-known games.

DOOM
Shared: Action · FPS · Demons

Ready or Not
Shared: FPS · Horror · Shooter

Left 4 Dead 2
Shared: FPS · Action · Horror

Phasmophobia
Shared: Horror · Psychological Horror · First-Person

Battlefield™ 2042
Shared: FPS · Action · Shooter

DOOM 3
Shared: Action · Horror · FPS

DOOM Eternal
Shared: Action · FPS · Demons

DOOM 3
Shared: Horror · Action · FPS

Resident Evil Village
Shared: Horror · Action · First-Person

Half-Life: Alyx
Shared: Horror · FPS · Action

Resident Evil Requiem
Shared: Horror · Action · FPS

Black Mesa
Shared: Action · FPS · First-Person

Call of Duty®
Shared: Action · FPS · First-Person

Half-Life 2
Shared: Action · FPS · First-Person

Outlast
Shared: Horror · First-Person · Psychological Horror

Trepang2
Shared: Horror · FPS · Action

F.E.A.R.
Shared: Horror · Action · FPS

Ravenfield
Shared: FPS · Action · War

BioShock Infinite
Shared: Action · First-Person · FPS

METRO 2033 Redux
Shared: Horror · FPS · Action

Escape the Backrooms
Shared: Horror · Psychological Horror · First-Person

Metro Exodus
Shared: FPS · Action · Horror

Lethal Company
Shared: Horror · First-Person · Psychological Horror

PUBG: BATTLEGROUNDS
Shared: Action · FPS · Shooter