Final answer:
States have the reserved power to regulate marriage laws, according to the Tenth Amendment of the U.S. Constitution, but must comply with federal Supreme Court decisions.
Step-by-step explanation:
The abilities of states to have different legal requirements for marriage is a reserved power. Reserved powers are a constitutional principle derived from the Tenth Amendment of the U.S. Constitution, which states that all powers not expressly given to the national government are intended to be exercised by the states. As such, while states can establish their own laws regarding marriage, they must adhere to federal rulings, such as those from the Supreme Court that recognize marriage as a fundamental right.