When it comes to your ex-wife, you need to forget about her and what you did to drive her away. Save the relationship lessons for the next person you meet, but stop thinking about your ex. You're never getting her back, and if she is cold enough to tell horrible lies to a court to take your son from you, I wouldn't regret that loss, if I were you.
What should be your main - actually ONLY - concern, is your son. You need to make sure you find some way to fight this - in an American court, if possible. That way the onus is on her to PROVE that you were all the things she said you were, but weren't. It's a sick thing that a woman would want to deprive her child of his father. She sounds like a cold hearted bitch.
Live as if you were to die tomorrow. Learn as if you were to live forever. - Mohandas Gandhi