You have to go back to the 1800's. There was an enemy repatriation act passed before there was a 14th Amendment.
The title 'US CITIZEN" is not the same as "AMERICAN". I am an American! I am proud of it!
Here I go getting clerical. The term US CITIZEN is based upon the 14th Amendment. It was developed because the united States of America government was closed in 1861 and the new United States of America was incorporated in Delaware as a Corporation to manage Washington DC. (DC Organic Act of 1871).
Thomas Jefferson was an American not a US Citizen, so was George Washington, John Adams, and the rest of the founding fathers.
When the Corporation commits a breach of law they must give you an out. This is that out.
If you send them notice that you are not a US Citizen their laws do not apply. That is unless you sign another contract and cause yourself to be in dishonor by asking for their benefits.