State courts handle the vast majority of civil and criminal cases in the United States. The reason for the numerous cases is because of their constitutional duties.
Constitutional jurisdictions of court cases
The United States federal courts are far smaller in terms of both personnel and caseload, and handle different types of cases.
Every state has the liberty to organize its courts as it deems fit. Therefore, no two states have identical court structures. Generally, state courts are common law courts, and apply their respective state laws and procedures to decide cases.
Therefore, the reason for it is as a result of the numerous cases and the fact that they are in charge of many civil cases (constitutional duties).
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