Not stupid. It's a good question. Yay forum jargon!
MFGs that I'm aware of (very general categorization):
Golden, Colorado: Sal or Eric designs with higher-end materials (PM2, Military, Yojimbo, etc.)
Taichung, Taiwan: Collaborations mostly.
Seki-City, Japan: Many (most?) VG10 models and their various iterations (Dragonflies, Delicas, Enduras, the Salt knives, etc.)
Maniago, Italy: A lot of slipjoints (PITS, Roadie, Pingo, etc.)
China (I'm not sure if there's a specified city): The budget line knives.
I'm sure others can refine the list above. And I'm sure it changes, too.