Did the format for social security begin in the U.S. or Europe?

The format for social security primarily began in Europe, specifically with Germany's implementation of social insurance programs in the 1880s under Chancellor Otto Von Bismarck. This model influenced other European countries and eventually inspired the establishment of social security programs in the United States, which launched its own Social Security system with the Social Security Act of 1935. Thus, while the U.S. developed its unique version, the foundational concept originated in Europe.