https://historyofmarket.com/ 2026-04-20 daily 1.0 https://historyofmarket.com/og/cover.png History of Market — The Chronicle of the U.S. Stock Market Editorial masthead and century-scale S&P 500 line chart. https://historyofmarket.com/llms.txt 2026-04-20 weekly 0.6 https://historyofmarket.com/llms-full.txt 2026-04-20 weekly 0.6 https://historyofmarket.com/ai.txt 2026-04-20 monthly 0.5 https://historyofmarket.com/api/_manifest.json 2026-04-20 daily 0.5