Political parties serve an important role in U.S. democracy, as they allow individuals with similar viewpoints to work together to shape public policy

Political parties serve an important role in U.S. democracy, as they allow individuals with similar viewpoints to work together to shape public policy. For the most part, the United States has had a two-party system throughout its history. Keeping this in mind, respond to the following: Explain how political parties differ from interest groups. Identify and discuss three reasons given by political scientists to explain the development and persistence of the United States' two-party system.