I just mailed a parcel of gifts to my US family and holy shit is it a nightmare. You *have* to use some US tech companies phone app that demands location permissions. It reaaaally wants you to take pictures of everything you are sending so it can use AI to determine what tariffs to charge.
Then, you have to prepay the duties (plus extra fees, because fuck you) and they give you a code that Canada Post uses to prove you've paid.
This will be the last thing I send to the US.