How did the United States acquire the middle 1/3 of our country in the early 19th Century?

the supreme court can hear any case it wishes as long as four justices agree to hear it.

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interest groups send representatives to state capitals and to washington, d.c. to put pressure on members of congress and other policymakers. they engage in lobbying, or the organized process of influencing legislation or policy. lobbying can take many forms. interest groups can testify in congressional hearings.