What caused British imperialism in Australia?

The reasons to why the British colonized Australia are the following, to send prisoners into Australia so there is no overcrowding of prisoners. Australia had Natural resources that the Brits needed. ... Also, British imperialized New Zealand to expand the empire and prevent the French from gaining land in that continent.

Because British imperialism was the earliest imperialism and because it had early seized Australia, Australia was a ready field for the investment of British superfluous capital. To this day the absolute volume of British investment in Australia is the greatest (the 1969 figure was $5,300 million) but its force has greatly diminished in comparison with that of U.S. imperialism.

Explanation:

profound political, administrative, and social changes in the british isles.