For the interview u do need 2 criminal reports from Morocco (Fiche Anthropometrique and a Casier Judiciaire from the Central Police station with English translations ) and only u can get these in person so a trip to Morocco will be neededwithin 90 days of the interview
also the marriage papers need to be translated into English
important are your plans when living in US (study or work)
20 years is hard to overcome but many have like us
u may find u r denied first application and have to reapply (many do)