Get a single country by its ISO 3166-1 alpha code. Accepts both 2-letter (cca2) codes like "US" and 3-letter (cca3) codes like "USA". This is the fastest way to retrieve a specific country when you know its standard country code. Returns an array with one country object.
Original spec description
Get a country by its ISO 3166-1 alpha-2, alpha-3, or numeric code.