Why does the US have multiple levels of courts?

In this country, we have two major court systems (federal and state) and numerous minor court systems (such as bankruptcy, admiralty, and military). Why do we have such a fragmented system? The framers of the Constitution wanted to create a third branch of the government, equal to the others. This is the federal judiciary. At the same time, they feared overreaching federal power, so they limited the power, or jurisdiction, of the federal courts. This has led to a dual court system, with each having its own key role.

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