There are countries where one has to renounce US citizenship to become naturalized by another (such as Japan, Korea, Austria to list a few) but have strict requirements like living there for years with language proficiency (like if an American moved to Austria without coming back, they have to learn German eventually knowing about their culture, heritage & history ensuring integration prior to acquiring a Austrian passport).

However, there are countries where dual citizenship is allowed (Canada, UK, AU) but what’s the point? I’ll say this: if an American person is fine with losing their retirement (pension), right to vote in the US, accepting terms that re-entry into the US is different since you are a foreigner (this time as a tourist) or revoked access to 401K for the sake of not wanting any association with the US or the Government (IRS) pursuing them.

For example, why do Americans have to pay taxes to US Government even though they’re not in the US? One could just renounce US citizenship given you are naturalized in someone else’s country first as the State Department won’t accept the application if it leads to statelessness. Only the Secretary of State can finalize the decision if you are now a foreign citizen, all to avoid owning anything back to the IRS.