I have lived in five US states in my lifetime, including three major geographic moves as an adult. With a country about twice the size of the EU - about the same size as Europe as a continent, we have a lot of regional differences. And I have experienced being told, "you'll aren't from around here are you?" a few times. Within a few months my accent adjusts, the cultural adjustments take a while longer. I learned a long time ago to not expect a new place to be like the old place. Some differences I will like, some I will adjust to, part of living there is accepting that things are as they are. The people and the place are not going to adjust to my being there, I need to adjust to the place.
Few if anyone in the America's is from here. Some of our families have been here for a long time, some of our family members arrived in the last 100 years, the blink of an eye in history and culture.
Immigration is an immensely complex issue. Immigration is a part of human life, past, present and future. As long as people feel unsafe or insecure where they live, some will move.