How did you land yourself in this mess? After all, you had to apply for these various visas and passports yourself.

What I know is this: Every country has different rules. India will not allow you to keep its passport if you become citizen of another country (but as long as you don't go to India, other countries won't care and the issue may not come up for a while). The US doesn't care if one has other passports, but anyone who holds a US passport must use it to enter the USA. Etc. I don't know what Australia's rules are, and if you can hold an Australian passport but travel from/to Australia on a different one.

Clearly, you need the advice from a competent immigration attorney familiar with Australian and US laws, not from members of an Internet forum dedicated to frequent flyer miles and airline status.

However, nobody can help you until you figure out yourself what you want. Where do you want to live and work? Which country's citizen do you want to be? What is most important to you - Australian citizenship, immigrating to the US, or Indian passport? As everything may not work out, you need to decide your priorities and proceed from there.

What are your plans - are you going to live and work in Australia, or in the USA? Whichever it is, I'd give priority to your status in that country. Let others fall where they might.

But again, talk to a good attorney and be willing to pay for his advice.

BTW, welcome to FT!