1. If you obtain a divorce decree in US it will be valid for all legal and practical reasons in India. Those who say that a foreign decree of divorce has to be mandatorily validated in India are wrong. However, the decree of US court can be assailed by your wife (who will then be your ex-spouse) in India to seek a declaration of it being non binding on her. So if she is still a citizen of India then it may be a better idea for you to seek dissolution of marriage in India instead of US, as this may spare you the ordeal of having to undergo a fresh round of litigation in India.
2. If and when she files a criminal complaint for dowry harassment against you and/or your parents in India then apply for and obtain anticipatory bail to preempt your arrest and detention.