In the case of Kenney, Trustee v. Effinger, the Supreme Court of the United States was asked to decide whether a trust created by a will was valid. The trust was created by the will of a deceased person, and the trust was to be used to pay the debts of the deceased. The trust was challenged by the executor of the will, who argued that the trust was invalid because it was not created in accordance with the law. The Supreme Court held that the trust was valid. The Court noted that the trust was created in accordance with the law, and that the trust was created for a valid purpose. The Court also noted that the trust was created in good faith, and that the trust was not created for any fraudulent purpose. The Court concluded that the trust was valid and enforceable. The Court's decision in this case established that trusts created by wills are valid and enforceable, provided that they are created in accordance with the law and for a valid purpose. This decision has been cited in numerous cases since then, and it has been used to uphold the validity of trusts created by wills.

In Kenney v. Effinger, the Supreme Court was tasked with determining whether a state court had jurisdiction to issue an injunction against a federal officer in order to prevent him from executing his duties under federal law. The majority opinion held that the state court did not have such authority and thus could not enjoin the officer from performing his duty. Justice Field dissented, arguing that while it is true that states cannot interfere with matters of national concern or those which are exclusively within the purview of Congress, this case involved only local concerns and therefore should be subject to regulation by both state and federal governments. He further argued that if a party has been wronged by an act performed pursuant to federal law then they should be able to seek redress through either their own government or through another sovereign power as provided for in Article IV of the Constitution.