As long as you were legally married in another country, you can file for divorce in the United States. You will still need to meet the residency requirements of the state you live in. You should contact a lawyer in your area to find out about the residency requirements.
You should check it out with a LA attorney, but I see no reason why you cannot get divorced in the US now that you reside here. The fact that the marriage is registered in another country doesn't determine jurisdiction; it is where the parties reside that counts.