Americans for Prosperity in the context of "Tea Party movement"

Citizens for a Sound Economy (CSE) (1984–2004) was a conservative political group operating in the United States. It was established in 1984 by Charles and David Koch of Koch Industries. Ron Paul was appointed as the first chairman of the organization.

In 2002, the CSE designed its tea party movement website, though the movement did not take off until 2009. In 2003, Dick Armey became the chairman of CSE after retiring from Congress. In 2004, Citizens for a Sound Economy split into two new organizations, with Citizens for a Sound Economy being renamed as FreedomWorks, and Citizens for a Sound Economy Foundation becoming Americans for Prosperity. Both organizations played key roles in the Tea party movement beginning in 2009.

The Taxpayer March on Washington (also known as the 9/12 Tea Party) was a Tea Party protest march from Freedom Plaza to the United States Capitol held on September 12, 2009, in Washington, D.C. The event coincided with similar protests organized in various cities across the nation. The protesters rallied against what they consider big government, the dismantling of free market capitalism, abortion, and President Barack Obama's proposals on health care reform, taxation, and federal spending, among other issues.

The lead organizer of the event was Brendan Steinhauser, who was serving as the Director of Federal and State Campaigns for FreedomWorks. Organizers of the event included the 9-12 Project, FreedomWorks, the National Taxpayers Union, The Heartland Institute, Americans for Tax Reform, Tea Party Patriots, ResistNet and Americans for Prosperity. The event was also promoted by Fox News commentator Glenn Beck as a symbol of what he called "national unity" following the eight-year anniversary of the September 11 attacks. The march is the largest gathering of fiscal conservatives ever held in Washington, D.C., and was the largest demonstration against President Obama's administration.