The Migratory Bird Treaty Act to ratify and implement the treaty was passed in 1918, and the resulting federal limitations on hunting were upheld by the Supreme Court in 1920 in the Missouri v. Holland decision.
The Migratory Bird Treaty with Great Britian (acting for Canada) was signed in 1916, and the Migratory Bird Treaty Act to ratify and implement the treaty was passed in 1918. The resulting federal limitations on hunting were upheld by the Supreme Court in 1920 in the Missouri v. Holland decision.