Popular games that aren't made by American developers?

Obscure and Obscure 2

Fortix of course!

Divine Divinity

King's Bounty: The Legend· ·
King's Bounty: Armored Princess (Crossworlds)

Crysis

Witcher series

Street cleaning simulator

Swedish Supremacy:
Minecraft
Amnesia: The Dark Descent
The Penumbra Series (If they're considered popular)
Sanctum
The Battlefield Series
Mirror's Edge

Pokemon and Touhou

Rock of Ages, well is American but not the America the OP is thinking.

DICE is Swedish so all games form DICE

Every Final Fantasy

Spec Ops: The Line

Crusader Kings 2

Chrono Trigger

Commandos saga (Are from my country Spain)

Successful troll is successful.

Magicka

TONS of japanese games

Ask 1000 of americans about the differences between Austria and Austrialia.

Our planet is a little more bigger than one country. I don't have a valid data, but i would assume that more than a half of all good games were made not by american developers and outside of both North and South Americas. But nobody can't challenge the fact that not less than a 40% of all good games were made, indeed, by american developers. There is a huge market and Gabe knows that.

Gothic (DE)
Witcher (PL)
Dead Island (PL)
Painkiller (PL)
STALKER (UA?)

This was never a PC game, but TimeSplitters 2 (UK)

I had some good memories with that game on my gamecube.

L.A. Noire

Crysis

Tetris

Super Mario, Zelda, Metal Gear Solid, Gran Turismo, all DICE games, Grand Theft Auto series, Colin McRae Rally series, Dead Island, Crysis series, STALKER, Metro 2033 and many more.