Is Australia a first world country due to it's support for USA?

australian's call themselves first-world country.What have they done?Most of them are of british origin,they have slaughtered all native people of Australia and supported USA.
How can it be a first world country?

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IT Consulting San Francisco

First of there are only countries....different countries have come up with the concept of 1st world country and 3rd world countries. Its sad that we want to create divisions just so that we can feel better.