I have read a couple of posts about the feasibility of America colonising Australia. All of the posts I read came to no feasible conclusion of its possibility, I, therefore, decided to solve the challenge. The aim of the is post is to give a hypothesis of a reasonable colonial possibility; whatever happens after that is completely open to discussion. There are two problems: Time is critical in this scenario. The chance of the US colonising Australia will not take place between 1783 and 1803-4 because there are no viable opportunities. (None of which I know anyway.) US territory from 1783 to 1845 is eastern to mid-west America which is completely opposite to Australia. The US would have to travel the entire Atlantic, past the Cape and the Indian Ocean. Therefore for the US to have a chance at colonising Australia The Californias and the West coast is a must have, because the US would only have to travel the Pacific. Oregon's west coast and the rivers are worthless at this point because they are not chartered or navigated and neither are the Californias, but they have already been settled by the Spanish which is something. The best opportunity comes after the Louisiana Purchase in 1803-4 but no later than 1820. The very best opportunity is in 1808 when the Peninsula War started and Spain becomes ravaged by civil war. Not only is it the best opportunity because Spain is weak but because Thomas Jefferson, who just doubled the US is still in power. If there is one person who could imagine such an abstract idea as the Manifest destiny it was him. He can either do two actions, he can buy what territory Polk conquered and if the Spanish refuse, he should be able to conquer it without much drama. If he does not conquer the territory by the end of his second term, Madison can finish the war. This comes to the third problem. War of 1812. Wars will hinder the US being able to colonise Australia because colonisation is expensive. Therefore the US should implement a no war policy regardless of the casus belli's they have on any of the squabbling European nations. If the US can buy/conquer by 1810 that gives them 10 years to understand this vast geographical area they now own. However, the real story starts when it reaches Madison that there is a vast "southern land" in the Pacific that is mostly uninhabited. As for state names 'American Sahul' sounds cool.