Immigrating to the US by giving up previous citizenship

I'm a bit confused here, a friend that is a citizen of the US told me that their father, who is Chinese, gave up his Chinese citizenship for US citizenship. But when I search the internet, nothing like this is mentioned? Does anyone have any idea if this is something you can do?

submitted by /u/Life-Parsley6166
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source https://www.reddit.com/r/immigration/comments/qwvv54/immigrating_to_the_us_by_giving_up_previous/

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