By the time the US was truly becoming a nation in the 19th century there were multiple different European populations and some even caused strife within the US like the Irish and Italians. Hell people even briefly disliked the Germans during WW1.
Unless you are about to sit there and tell me that Europeans are a homogeneous people and culture then the US has always been a diverse nation.
Very few empires/nations in history can claim to be as diverse as the US and usually when it came to empires it's because said empires conquered many different peoples.
that's my point. we weren't disagreeing. it's always been people infighting in the US. "fragmented cobb salad" is a slightly better way to describe the US history than "melting pot".
Thomas Sowell is a pretty dang sharp tack and is capable of articulating his points without sounding like a complete jackoff. Grouping him with Milo is kind of weird.