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Houses in the US have thin walls. Nothing prevents something slightly denser without it being row houses, and something mixed use without it having loud and obnoxious night life.
US row house owner here: Air-gapped, sound-insulating walls DO exist here. I never hear my neighbors or their kids. My only regret is having a car when I moved here. It just sits there rusting since I can walk and bike everywhere, including to work. Should have sold it 10 years ago.