http://www.wodarczak.net/althist/australia.html
At first the Dutch East India company regarded the vast deserts of Nieuw Holland as an inconvenient extension of its territory in Batavia, but when the British took control of Batavia in 1811, the Dutch colonists moved their headquarters to the town of Jansz on the south-western coast of the continent (now the national capital) and began to see the potential for flooding. Back in control of Batavia in 1816, they shipped thousands of spice islanders to the mainland to work as slave labour on the vast inland sea project, which was nearly 100 years in the making.
By the 20th century, Nieuw Holland was a major exporter of coffee and flowers grown around the transplanted Zuider Zee.
But the spice islanders were bitter and they formed a nationalist movement to claim freedom for what they began to call Indonesia. When the Indonesians declared their independence in 1945, the white settlers moved en masse to Nieuw Holland, which did not gain its own independence from the Netherlands until 1962.
Nieuw Holland now has a population of 20 million, mostly staunch, hardworking Protestants with a commitment to
the environment through
solar-energy collectors in the desert and sleek windmills strung along the 5000 km network of canals.
Still, a very interesting idea. To see the differences in Aboriginal culture possibly? And of course the world stage. I like the ideas though.