Sure, and swear to give up all allegiances. But, I did not have to legally renounce any existing citizneships. Including the US, I am a citizen of 3 countries.
Well then, according to the original intent of the Constitution your being a citizen of 3 countries would not fly. Our founding fathers would not accept that. They wanted allegiance to the US and only the US. Like I said, look at the history, they fought a war for independence FROM England. They did NOT want dual citizenship with England.
During the War of 1812, England tried to pull the dual citizenship card, they impressed upon American citizens to fight with them because of England’s common law of citizenship at birth and the once a citizen always a citizen ideal.
According the to the CONSTITUTION, at the time, you would not have been granted citizenship WITHOUT giving up your allegiances to the other 2 countries.