Trade agreements have been used to require other nations to extend their copyright terms to match the US, eg Canada: https://cassels.com/insights/copyright-ter

Trade agreements have been used to require other nations to extend their copyright terms to match the US, eg Canada: https://cassels.com/insights/copyright-term-extension-in-canada-will-come-into-force-december-30-2022/ https://cassels.com/insights/copyright-term-extension-in-can...