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I agree with that too guys.
A bona fide resident must have those things (DL, bank account, SSN, and report of filed taxes when due) at any time when leaving the country. We all agree with that.
Now we can ask what are other factors/ties that show you are immigrant. I would say, is it just one's behavior? About what he/she thinks where he/she lives and so on.
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Consider this when comparing two (2) permanent residents:
Resident A owns 3 houses, small business, and a car in the United States. However, he has also other big businesses, 10 properties and other assets overseas.
Resident B has nothing. He has nothing in the States, but also nothing overseas. All he has is the desire to settle down somewhere in the United States.
Questions - when A and B are absent for the same amount of time:
Who is "better" resident? The A can show many assets linking him here, while he actually has more assets there. Person B has apparently nothing besides DL, account, etc, but the ratio of assets is better than A.
Or is it true, that the officers compare what one has in the U.S. and in other countries? If yes, how they can do it?