How to add a column to a dataset made up of an association of associations?

A dataset can be created in at least two ways: first, from a list of associations, second, from an association of associations (I know that it is also possible to create it as a list of list and an association of lists, but these last two cases are not relevant).

1. This is a list of associations.

ds = Dataset@{ <|"nombre" -> "Aileen Agüero García", "edad" -> 25,"licenciatura" -> "Economía", "universidad" -> "PUCP"|>, <|"nombre" -> "Alvaro Gálvez Pasco","edad" -> 45, "licenciatura" -> "Ciencia política", "universidad" -> "PUCP"|>, <|"nombre" -> "Gastón Zapata ", "edad" -> 55,"licenciatura" -> "Antropología", "universidad" -> "PUCP"|>, <|"nombre" -> "Jose Velasco", "edad" -> 55,"licenciatura" -> "Economía", "universidad"-> "PUCP"|> }; 

and the dataset is:

If I want to add a column I do the following:

(* Agregar una columna con distintos valores a un dataset *) col1 = {1, 2, 3, 4}; (*se crea una lista de valores*) nuevo = Dataset[AssociationThread["ID" -> #] & /@col1]; Join[nuevo, ds, 2] (*finalmente se unen los dos datasets usando el nivel de especificación 2*) 

And the output is:

2. Now, if I have an association of associations:

baseDeDatos = <| "Registro1" -> <|"Nombre" -> "Juan", "Edad" -> 25,"Ciudad" -> "Madrid"|>, "Registro2" -> <|"Nombre" -> "Maria", "Edad" -> 30,"Ciudad" -> "Barcelona"|>, "Registro3" -> <|"Nombre" -> "Pedro", "Edad" -> 22,"Ciudad" -> "Valencia"|>|> 

I don't know how to add a column to it. For example, I have tried with the following code:

ds2[All, Append[{"Estado civil" -> "Soltero", "Estado civil" -> "Casado", "Estado civil" -> "Viudo"}]] 

But there is an error in the output. Please help me!