In Missouri v. Holland,  252 U.S. 416 (1920), the Supreme Court considered 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.
In Missouri v. Holland (252 U.S. 416, 1920), the Supreme Court considered how international legal obligations are incorporated into federal law. The case examined the constitutionality of the Migratory Bird Treaty Act of 1918, which prohibited actions related to migratory birds under an earlier treaty with the United Kingdom.