Hong Kong is an Autonomous Country. Its official language is Cantonese. Bart visited it during his time as a courier and delivered a pair of eyeballs. Seymour Skinner went on vacation while Bart was a courier and spotted him in the airport.
At the time of the original broadcast of "Bart on The Road", Hong Kong was a British crown colony until it was formally handed over back to the Chinese government in an official handover ceremony on July 1 1997.