For purposes of discussion and to avoid a lot of awkward phrasing, let's label the parties involved: A and B are married. A wants a divorce in order to marry C. B is contesting the divorce.
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No. An engagement is a promise to marry. In many jurisdictions an engagement is a legal commitment with the possibility of legal consequences if the engagement is broken. A married woman cannot make a legal promise to marry someone else. She is not free to marry until she has legally dissolved her existing marriage.
Anyone can contest a divorce. Just because a divorce is contested does not mean a divorce will not be granted, it just means it is going to be a longer and more expensive process.
If you are contesting I would highly recommend getting a lawyer and really ask yourself is it worth the pain and cost. If you are contesting the divorce because you just want to stay married to this person I would say you are fighting a loosing battle. If you are contesting the property division, get a lawyer and be prepared to loose a good chunk of the assets in the fight.
If you have a marriage certificate, that is your proof. If someone is contesting this, it is up to them to produce divorce documents. Even if you were in the process of getting a divorce at the husband's time of death, if there was no divorce decree, there was not yet a divorce.
Your wife cannot contest the divorce itself; she can only contest the division of property and assets of the marriage. The divorce case cannot go on forever; there will be a trial and the assets will be divided fairly by the court.
Divorce is the legal dissolution of a marriage.
There is no such thing as an unofficial divorce. Marriage is a legal status. A legal marriage must be dissolved by a legal divorce. Otherwise, the parties remain married.
You can't have a legal divorce agreement if you never had a legal marriage. You should review your situation with an attorney.
One way to find out if a Mexican divorce is legal is to contact the courthouse in the town the divorce took place. You may also be able to have an attorney from America find out if the divorce was legal.
Divorce!
The legalization of divorce is when a country or government passes a bill that makes divorce legal. The legal requirements for divorce may be different in each country and state.