If the divorce to the first wife is not final, your marriage to the current wife is invalid.
In WA, it does not matter how long ago your alleged divorce was done. If the court order alleging to dissolve your marriage was invalid 10 years ago, the court remains invalid today. The laws likely are the same wherever you obtained your divorce.
The path of least resistance likely is to supply USCIS with truthful documents demonstrating what USCIS wants to be demonstrated.
Arguing with USCIS that the request is unreasonable may not be very productive for you. In the best scenario for you, arguing will delay the processing of the petitions.
You should review the specific facts with your attorney to see how you can comply with the request from USCIS.
It sounds like USCIS isn't convinced your divorce is valid. Definitely address this directly and thoroughly. If you are not sure what documents to submit, hire a lawyer ASAP.
Maria J. Marty Attorney at Law | firstname.lastname@example.org | Office: 206.494.9999 McAuliff Law Firm | 14205 SE 36th St., Suite 100 | Bellevue, WA 98006 www.mcauliffimmigration.com Skype ID: mjmarty-mcauliff This is general information and not legal advice. For a more complete assessment of your situation, please contact our office. Our practice is limited to U.S. Immigration Law. Our attorneys have over 20 years of experience representing international companies, investors, professionals and families with US immigration matters.
I agree with the attorneys above. USCIS is often times more thorough than you or I believe is necessary. Based on the facts that you are requesting, their request is odd....Is there any reason why they would think that your previous marriage ended without a divorce? (i.e. separation, funds still commingled, etc)