Manhattan (not to mention Staten Island, as well as Queens and Brooklyn which are geographically on Long Island) is also an island, just like Australia (and Tasmania.) Clearly they should have isolated themselves before covid took hold. ;-)

You are proportionately about as bad as the United States is in deaths right now.

Cite your data.

Start here: https://91-divoc.com/pages/covid-visualization/

Showing new deaths per day with 1 week averaging normalized by population, the US is about 2-3x Australia right now.

As for new confirmed cases per day normalized by population, everybody is about the same because Omicron is so infectious. I suspect the US number is a bit undercounted because the number of cases spiked so fast that confirmed cases simply couldn't keep up.

False. The US has had 2,687 deaths per million population since coronavirus began. Australia has had 128.

In the last 7 days the US has had 46 deaths per million population. Australia has had 17.

See for yourself: https://www.worldometers.info/coronavirus/

(Australia is starting from near-zero natural immunity, too.)