Sorry, but you are completely wrong on this. The US government has no control over the citizenship laws of other nations. It is therefore possible to be both a natural born US citizen and meet the citizenship standards of certain other countries by birth. Also a person can be a natural born US citizen and later apply and receive citizenship in certain other countries, thus holding dual citizenship.
I agree!!
Yes you CAN hold dual citizenship!!! You are correct!!!
(Ummm.. it just makes you ineligible to run for POTUS)
But you ARE correct!!!!