As you are in the United States, you just need to be in the United States with a United States phone number to verify that you are a United States with a United States phone number. If you are not in the United States and/or you do not have a United States phone number, then you will have some issues.
If you are pretending to be in the United States, this may be a moment of clarity. If you are not, then I suggest correcting your nationality and using your local phone number.
This is to stop cheats, scammers and liars.