The first of the 5 international and UN treaties that the Endangered Species Act is based on is the Migratory Bird Treaty Act of 1918.
The federal government used the Commerce Clause to usurp authority over hunting, but this was an overreach of power, so some states opposed the federal government and won their case in 2 lower federal courts based on the Tenth amendment. Congress was upset over the cap on their power so they made a treaty with Canada, the Migratory Bird Treaty Act of 1918, in order to turn this into an international law issue.
Again, several states opposed the feds and sued; the lawsuit, Missouri vs. Holland, went to the Supreme Court. Justice Oliver Wendell Holmes wrote the majority opinion that strengthened the federal overreach of the Commerce Clause and he grossly misinterpreted the Supremacy Clause to mean that treaties supersede the Constitution, even when they are unconstitutional.
Oliver Wendell Holmes is famous for another bad ruling favoring forced sterilization.
Currently, the Endangered Species Act is being used as a tool by globalists for depopulation under the UN program known as Agenda 21 Sustainable Development. The Tenth Amendment may be used by the States to stop the federal overreach of the Endangered Species Act.
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