The Tea Party exploded on the US political scene with President Barack Obama’s election and scholarly research focuses on its role in national issues. However, Tea Party and property rights advocates, among others, also fiercely oppose sustainability city planning issues, recently having legislation introduced in 26 US states to stop such practices. They perceive planning as directly connected to the United Nation’s 1992 document, Agenda 21: the Rio Declaration on Development and Environment. The counter-narrative suggests the UN seeks to restrict individual property rights and American sovereignty. Meanwhile, Agenda 21-related planning is favourably considered and practiced worldwide. Through a mixed-methods approach using quantitative and case-based research, we track the opposition’s emergence through the introduction and sometimes adoption of state legislation. We draw conclusions and implications for research and practice using a theoretical framework routed in scholarship from planning, geography, political science, and communications/new media.