We may have actually exported it to the rest of the world! In 1970, we had the Hutt River Province secede from the nation of Australia. To be fair to old Prince Leonard - he had valid grievances and was not just a nutter. The Australian Government was imposing wheat quotas on him when he was just about to harvest, and frankly didn’t exactly offer him much in the way of services.

According to my 2-minutes of Wikipedia research (which makes me an expert on this topic, don’t you know?), the Soverign Citizen Movement appeared in the USA in the “early 1970’s”. Which sounds to me like it may have drawn inspiration from the waves that Prince Leonard was making in Western Australia.