ARTICLE III section 2

SECTION. 2.
 The judicial Power shall extend to all Cases, in Law and Equity, arising under this Constitution, the Laws of the United States, and Treaties made, or which shall be made, under their Authority;--to all Cases affecting Ambassadors, other public Ministers and Consuls;--to all Cases of admiralty and maritime Jurisdiction;--to Controversies to which the United States shall be a Party;--to Controversies between two or more States;--between a State and Citizens of another State (Modified by Amendment XI); ;--between Citizens of different States;--between Citizens of the same State claiming Lands under Grants of different States, and between a State, or the Citizens thereof, and foreign States, Citizens or Subjects.


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. In all the other Cases before mentioned, the supreme Court shall have appellate Jurisdiction, both as to Law and Fact, with such Exceptions, and under such Regulations as the Congress shall make.

The Trial of all Crimes, except in Cases of Impeachment; shall be by Jury; and such Trial shall be held in the State where the said Crimes shall have been committed; but when not committed within any State, the Trial shall be at such Place or Places as the Congress may by Law have directed.
 
Article. XI. Proposed 1794; Ratified 1798
The Judicial power of the United States shall not be construed to extend to any suit in law or equity, commenced or prosecuted against one of the United States by Citizens of another State, or by Citizens or Subjects of any Foreign State.



The jurisdiction of the federal courts is limited by subject matter. The federal courts can hear cases “arising under” the Constitution, U.S. laws, and treaties with foreign nations—as well as cases involving diplomats and the law of the sea. The federal courts also have jurisdiction over cases involving certain parties, such as the United States government or citizens of different states. So this provision of Article III was to avoid the possibility of prejudice by state courts against the federal government or citizens of other states.
 
 
Sorry, been healing a bruised liver from this past weekend, yearly b-day gala. Not as "liquid" fit as me once was but as good as I ever was. Thank you for your comments and read alongs. sharky