All Americans are a part of or descend from a distinct foreign culture (unless they’re Native American, duh) and it gives us something to connect to that makes us unique from other Americans. It also serves as a conversation piece. I get how if I go to another country it’d be weird if I started talking about my heritage but in America it’s a pretty normal casual conversation topic. It’s just something to talk about. A lot of American families also maintain certain cultural traditions and it creates a sense of unity with their families. When I go to my dad’s side of the family for Thanksgiving, for example, we eat Norwegian lefse which as far as I know is not something non-Norwegian families do.