Because of the separation of powers and federalism, the United States offers a favorable environment for interest groups to try and influence policymakers.
Additionally, the tradition of free speech and association means that there are few legal restrictions on the activities of interest groups, and the culture of people banding together encourages people to look to interest groups as a means of influencing policymakers.
A group that uses a variety of advocacy techniques to sway public opinion and/or policy is known as an interest group or an advocacy group. Another term for an interest group is educated society, a society at the university, a special interest group, or a collection of people sharing specialized expertise.
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