They can "change" the Constitution by making rulings in lawsuits on the meaning of the Constitution's wording. They don't change, add to or subtract from the words in the Constitution the way an Amendment would, but they can read the same words differently. A good example is the one concerning racial segregation. In the 1896 case of Plessy v. Ferguson, the Supreme Court ruled that separate restrooms for whites and blacks was not unconstitutional as long as the facilities were equal. In effect, racial segregation was constitutional. Then the Supreme Court in the 1954 case of Brown v. Board of Education ruled that "separate but equal" facilities were inherently unequal and therefore unconstitutional. In effect, segregation was now unconstitutional. The Constitution had changed even though not one word, comma or sentence of the Constitution had been changed in the time between the two cases.
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Courts have jurisdiction over interpretations of the constitution and can suggest amendments. The supreme court was the only one mentioned in the US constitution.
Article III refers to such courts as "inferior," although certain lower courts are also described as "tribunals" in other parts of the Constitution.
Technically, the Constitution does not specifically provide for federal district and appellate courts in the sense that it createsthem. Article III, Section 1 of the Constitution vests the judicial power of the United States in one supreme Court and in such inferior courts as Congress may from time to time ordain and establish.
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Article III of the US Constitution refers to them as "inferior courts."