Why did the constitutional congress decide to create three branches of our government?

The three-branch system established a strong central government without giving too much power to any one group.

Explanation:

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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.