Aque se refiere el autor de la carta al afirmar que tiene "una objecion de caracter historico

possibly, to the argument that someone opposed an idea to deny it and had to do with history or related to that discipline.

Explanation:

Is defined as:

Objection: Reason or argument that someone opposes an idea or proposal to reject it, deny it or prevent it from being carried out.

Historical: That begins with the appearance of the first written testimonies, as opposed to the prehistoric period.

Character: A set of traits, qualities or circumstances that indicate the nature of a thing or the way of thinking and acting of a person or a group, and by which it is distinguished from others.

Then, it can be assumed that it was an argument or idea that someone opposed another idea to counter it and prevent it from being carried out, with historical features, since it could be said that the objection was made in a period or with respect to a fact very important, that's why "historical"