Since 1975, the United States has increasingly led global governance through its central cooperative role in the G7 summit of major market democracies and its 2008 summit offspring, the G20 systemically significant states. In the years following their establishment, US presidents from both political parties have effectively leveraged both the G7 and later the G20 summits to address pressing global crises and policy issues. The United States has produced institutional, material, and policy leadership but never sought a privileged place nor led alone in these informal institutions governing today’s intensely globalized world. In the coming years, a more vulnerable, less powerful US will need and cooperatively lead the G7 and G20 even more, especially as their hosts are fellow democratic countries in 2021 and 2022.