If you are born in the US and a US citizen, customs cannot keep you out of your home country. However you are supposed to have your passports by june 1.
Both of my neighbors are customs agents in I. Falls, plus I went to school with 3 other customs agents and they all have been telling me the same thing for the past few months. You are supposed to have them, but they can’t/won’t keep you from going home.
I have a group coming up on the 4th of june and 1 guy doesn’t have his passport, so I again checked today to see if he was going to have an issue and agent Shawn Sherotiak told me to tell him to make sure he had his driver lic. along with his birth cert. and he will be fine.
Again, I am not telling everyone they don’t need to go get one. However Customs in I. Falls will still let you cross if you don’t have one, I’m sure they will tell you to hurry up and get one though.
Good Luck