Does USA has access to info in mexico?

Whether the US government has access to such information pertaining to your marriage in Mexico, you are guilty of bigamy in marrying multiple partners. That is a crime in this country. If you put in paperwork for your green card without mentioning the fact of your marriage in Mexico, you would also be guilty of immigration fraud. I suggest that you take whatever steps that you must to legally divorce your husband in Mexico, then remarry your US citizen husband, and only then file for your permanent residence.  

You should get divorced in Mexico and then remarried in the US and then file your immigration paperwork based on the remarriage.  In every state in the US, you may not marry again if you are still married.  If you lied to the licensing authorities about your marital status, that can create a host of problems for you later on.  You will have to perpetuate that lie to immigration, which in turn will mean any immigration benefit you receive, including citizenship later, can be revoked if the truth ever gets out.  Immigration may learn about the true situation other than through official channels.  The risk is too great and you should not perpetrate a fraud on the courts or the immigration service.