[An American In Dairyland]

Please remember that they did not get married on dry land.

They didn't get married anywhere. They didn't have a license. No license = no legal marriage.

[Sacajaweau]

There is a method of getting married at sea and having a license filed AFTER the ceremony. Anna might have thought that one would be and could have signed it on the boat.

The reason I even considered the possibility is because I don't believe she said anything about a real marriage AND you and I know she would have had a dress in the works.