If someone was born and raised in Poland, for example, then went to the United States and lived there, they would be considered Polish American.
My story, however, is a bit more complicated. I was born in Chile and stayed there with my family until I moved out as a child. Then, I lived in Brazil until I was 13 and moved to the United States. When I was 17, my family and I moved to France. Am I just Chilean-French or something? Chilean?
If asked, I would just say « Je suis né au Chili mais je réside à France maintenant. »
When people ask me where I’m from and the question is justified, I tell them and briefly describe the geographical position of my very small homeland. If anyone asks just to be nosy, I say I’m legal and stare them down. When the race is relevant like in GPs office, I’m white European/other. All depends on situation I’m asked.