Aborigines are believed to have arrived from Asia originally. However, if you are referring to the more recent settlers, their ethnic origin is, for the most part, Caucasian. In 1788 the first people (convicts and officers) arrived from England. After that, more convicts came from Ireland and other parts of the present day United Kingdom. Once free settlement began, shortly after the First Fleet, people began to arrive from all over the world - initially the European countries, but from other continents also as the 1800s progressed.