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nice try

The reference only says,

“As the Second World War raged in Europe, on March 10, 1942, the U.S. District Court in Brooklyn made Mary Trump a naturalized citizen.”

You added the “in those days ... “ business.

Do you have a reference that backs up your claim about “back in those days” naturalization automatically renounced prior citizenship?

Here’s my source:

U.S. Immigration Law Allows Dual Citizenship

It would be nice if the U.S. Congress had, at some point, simply spelled out within the Immigration and Nationality Act (I.N.A.) that dual citizenship is allowed by the United States. It hasn’t done so. In fact, you won’t find any formal or official recognition of dual citizenship as an immigration status.

What’s more, the oath of allegiance that immigrants must take in order to become naturalized citizens declares that the immigrant will:

renounce and abjure all allegiance and fidelity to any foreign prince, potentate, state, or sovereignty, of whom or which I have heretofore been a subject or citizen.

That’s enough to make anyone think that they must choose between whether to be a citizen of the U.S. or of their home country.

Nevertheless, U.S. practice, as upheld in various court decisions, is to allow dual citizenship. (You can see this on the U.S. State Department’s website, for example, where it explains that: “U.S. law does not . . . require a person to choose one citizenship or another.”)

The United States will not ask naturalizing citizens to take any steps to formally renounce the citizenship of their home country. Nor will it stop U.S. citizens from later adopting citizenship in another country – though if their intention is to give up U.S. citizenship, they can certainly do so. You may continue to vote in your home country, if it allows it.

from:

https://www.nolo.com/legal-encyclopedia/dual-citizenship-allowed-naturalizing-us-citizens.html