A court of original jurisdiction is simply a court authorized to hear and decide a particular case first, often as a trial court. A judge or jury acts as a "trier of fact," and reviews evidence, testimony and arguments in an effort to determine whether the prosecution or plaintiff has proven its case to the degree required by that court. In a civil trial, the plaintiff may only have to demonstrate that something is "more likely than not," while a criminal trial requires proof "beyond a reasonabledoubt."
There is a court of original jurisdiction for every type of justiciable case. For example, US District Courts have (original) general jurisdiction over many common federal civil or criminal cases within a defined territory; US Tax Courts have (original) subject-matter jurisdiction over federal tax cases within a defined territory. Federal, state, county and municipal court systems all have courts of original jurisdiction to hear the spectrum of cases.
Please note this answer is over-simplified due to the broad nature of the question.
The Supreme Court of the United States has fewer cases of original jurisdiction than other courts with original jurisdiction (trial jurisdiction); the appellate courts have none.
US District Courts have original jurisdiction in most cases of general jurisdiction; however the US Supreme Court has original jurisdiction in a limited class of cases, such as those involving disputes between the states.
US district courts have trial jurisdiction (aka original jurisdiction) over federal court cases.
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The court of original jurisdiction where the principals legally reside.
In cases involving ambassadors, it is the Supreme Court of the United States that has original jurisdiction. The Supreme Court was formed in 1789.
Section 2 of Article III of the constitution sates:"In all cases affecting ambassadors, other public ministers and consuls, and those in which a state shall be party, the Supreme Court shall have original jurisdiction."The Supreme Court has original jurisdiction in cases involving two states, and cases involving ambassadors, consuls, or other public ministers.This is not to be confused with appellate jurisdiction. Original jurisdiction is when the court hears the case first. Appellate jurisdiction is when the court hears an appeal from another court of original jurisdiction.
The questioner is mis-understanding the phrase "Court of Original Jurisdiction." Such a court hears cases that occur and originate within their assigned area of geographical and judicial jurisdiction.
All federal courts hear cases on appeal or original jurisdiction cases.
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