Scenario 1- Wanting to Travel to Australia, and I hold a Australian citizenship, and had a Australian Passport which expired years ago, and I got it before 16 years of age. Can I use my US passport to enter and leave Australia or will they see I'm a citizen and ask for my Australian passport? Reason for my query is from Scenario 2.
Scenario 2- I travel to Toronto, Canada Quite often, I have a candian citizenship card and a US passport. Never bothered getting Canadian passport. So been going with my US passport to enter CANADA. Yes even when needing to prove I'm a candian citizen I used my card, was useful during covid. In this scenario they never asked or cared about my having candian citizenship and no passport, and using my US passport worked just fine. Even asked one of the border agents if he can see that I hold candian citizenship when I gave him my US passport, he answered, no. He said if you tell me you have citizenship then I'll know. Otherwise I have no way of knowing what citizenship you hold.