Divorce to gambling addicted husband

Hi Mam/sir, I got married in 2010, when I am first time pregnant I came to know that my husband having some debts with his friends and family friends bcs of his gambling habits..I have tried to change him and given money by taking from parents to get his debts off and start new life..but he continues to cheat me but never changed after my second delivery I came to still he is having so many debts then I have gathered him with my parents and hi brother finally he agreed that if we are selling 2 achers of land then all the debts will be gone ..but he never changed in 2018 I came to usa and then in Facebook messanger i have got so many messages still receiving asking is I am wife of him and saying he has taken money form him asking me to pay..he has absconded and giving my I'd details and photo details to them to block mail me..my daughters are with my parents I am doing hard work for them as lost every thing bcs of him.. I want give divorce to him and I want my children with me..he is no ware eligible to take care of them.. as I am in usa now what is the procedure to apply divorce please help me on this