The G20 emerged at the center stage of global economic governance in 2008. At the time, it was designed to be an inclusive and effective intergovernmental body. However, we find evidence of a slowdown of the G20's development by tracing the evolution of the G20 agenda during the seven summits held to date. We argue that the principle reason for the lack of progress is that the expansion of the issues covered by this international organization created new dividing lines among G20 members and also made preexisting ones more salient. Rather than reaching increasingly shallow consensus on a wider a range of issues, state leaders should sharpen the G20 agenda, avoid politicization, and frame issues in ways that prevent the formation of opposition along national lines.