Where do the majority of cases heard by the supreme court originate?

Few original jurisdiction cases are filed—usually one to five a term—but sheer bulk makes many of these difficult. In 1952 Arizona sued California over water from the Colorado River. The completed trial record covered more than 26,000 pages. Briefs and other documents filed by the states took 4,000 more. The Justices heard 16 hours of oral argument in the fall of 1961, six hours more in November, 1962. Arizona prevailed in the Court’s decision in 1963.

Explanation:

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