3. what is the main purpose of interest groups?

The correct answer to this open question is the following.

The main purpose of interest groups is to influence Congressmen to create the kind of legislation that can favor their political and economic interests. Many times, these interest groups hire the services of lobbyists to negotiate with legislators in Washington D.C. Some examples of interest groups in the United States are the American Bankers Association, the United Farm Workers of America, or the National Association of Manufacturers.

answer; ///i believe that the correct answer is (a) the great depression

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