Anonymous. (2026). The premise that US-specific algorithmic tuning explains US-specific polarization is unsupported speculation; US-specific non-algorithmic factors (two-party system, partisan media, elite polarization) are more parsimonious explanations. Isonomia. https://www.isonomia.app/a/tSY5TEYA@caeb99fb7da1a7f19de3ebfb5de424104e94282a8b5b3ffdfdc9ef3b2c263a7a