Check out, "The Coming Collision - Global Law vs. U.S. Liberties", by James L. Hirsen, Ph.D. (ISBN 1-56384-157-6) for a more detailed summary of the history of how treaties were introduced as a method to deliberately circumvent the Constitution.
I would also recommend browsing through Larry BeCraft's website which details the legalistic shenanigans on how the federal government has used treaties to steal municipal power.
I forgot to add, or so they would like us to believe.