I'll try to explain. The melting pot is real. I am the son of immigrants, the first American born in my family. My wife is the daughter of immigrants. I am proud of my heritage, but I am also 100% red, white and blue. You can have a Greek Town, China Town, etc., and still know who you are.
The English and Scotch resisted the Irish. Before you know it they were intermarrying. The Germans didn't come to the US and tell the Irish, you are infidels, we will enter your homes and convert you to Lutheranism while we rape your daughters. Everyone added to the melting pot. Everyone was just happy to be here and work, have opportunity, progress and raise a family. Greeks marrying Italians, Germans marrying Dutch.
Next thing you know, we're all Americans. And if you are first or second generation or so, you still keep your traditions from the "old country" alive.
It's a beautiful thing.