I'm not implying anything about the fabulous people of Australia- my great uncle emigrated to Australia from Ireland and had a sizable sheep station.
Furthermore if I had something bad to say I'd say it. I wouldn't merely imply it.
Finally, Americans is plural and doesn't need an apostrophe.
Please explain why you used the words 'British penal colony' instead of Australia if you weren't implying anything.
Furthermore, use of the word furthermore at the beginning of a sentence requires a comma. Thanks grammar police.