Australia's legacy of introduced species is largely one of Invasive types.

That would echo the state of Missouri and, most of them were introduced by the Missouri Department of Conservation. We're inundated with non-native plant species that are a constant battle, hogs and various insects. 100+ years ago, evidently some homesick Englishmen had English Sparrows and Starlings brought to the US. They both do their share of displacing native species and, starlings are purely filthy birds.