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Who lives longer, the USA or Europe? An in-depth comparison of longevity factors

According to the Peterson-KFF Health System Tracker, life expectancy in the United States remains significantly lower than in comparable European nations, with the average U.S. lifespan in 2023 being 4.1 years shorter. This persistent gap prompts a deeper examination into the complex factors that answer the question: who lives longer, the USA or Europe?