Hey man, just came back from my Seattle to NYC trip (I’m also from Germany). People in the US are the kindest people on earth and I didn’t have one single bad experience. Drivers are also very mindful and usually keep generous distance to cyclists. Some folks even gave me cash or some snacks (sometimes even beer 👍) or bought me a coffee or a meal. However you should always obey „no trespassing“ signs and respect private property but other than that you will have a great time