Most people who immigrate and acquire US citizenship are thinking or want to reclaim their original citizenship and passport as a safeguard, or want to leave and go back home.
Months ago, I spoke with a uni friend who is Australian and married to a yank, and has a US citizenship, and has been living over there for the last decade.
In recent months, she has been exploring the possibility of having dual citizenship (Australian and American). She was in the process of reclaiming her Australian citizenship and passport because she never wanted to lose her Australian citizenship or passport, even after becoming a US citizen.