It is clinically insane that new immigrants have to swear an oath of allegiance to the US, forsaking all former allegiances...and we have fucking DOZENS of congresscritters who will not do it. They are citizens of Israel first, America second (or last), and that's that.

No, this is not correct. The US does not make new immigrants give up their citizenship to their native country.

Some countries won't allow their citizens to retain their native citizenship if they gain citizenship in another country. Some do, though, like the US.

I don't know why so many people here don't know this. It's like Civics 101.

"U.S. law does not require a U.S. citizen to choose between U.S. citizenship and another (foreign) nationality (or nationalities). A U.S. citizen may naturalize in a foreign state without any risk to their U.S. citizenship."

https://travel.state.gov/content/travel/en/legal/travel-legal-considerations/Advice-about-Possible-Loss-of-US-Nationality-Dual-Nationality/Dual-Nationality.html#:~:text=U.S.%20law%20does%20not%20require,risk%20to%20their%20U.S.%20citizenship.

"U.S. law does not impede its citizens' acquisition of foreign citizenship whether by birth, descent, naturalization or other form of acquisition, by imposing requirements of permission from U.S. courts or any governmental agency. If a foreign country's law permits parents to apply for citizenship on behalf of minor children, nothing in U.S. law impedes U.S. citizen parents from doing so.

https://www.usa.gov/dual-citizenship