Missouri v. Holland, 252 U.S. 416 (1920) is a United States Supreme Court decision on the extent to which international legal obligations are incorporated into federal law. The case centered on the constitutionality of the Migratory Bird Treaty Act of 1918, which prohibited the killing, capturing, and selling of certain migratory birds pursuant to an earlier treaty between the U.S. and the United Kingdom. The state of Missouri challenged the enforcement of the Act within its jurisdiction, arguing that the regulation of game was not expressly delegated by the U.S. Constitution to the federal government, and was therefore reserved for the states under the Tenth Amendment; accordingly, the U.S. government had no constitutional right to enter into a treaty concerning game regulation.