The first three characters of a VIN are the World Manufacturer Identifier (WMI). They're assigned through a system run by SAE International on behalf of NHTSA, using ISO 3779 region and country ranges. For buyers, the WMI is a quick sanity check on where and by whom a car was made.
Source: [Dev.to](https://dev.to/vin_lookup_8dbd4710f77e9e/wmi-codes-for-buyers-what-the-first-three-vin-characters-say-about-where-a-car-comes-from-4k5l)