How would you describe the tone of Christopher Columbus's letters?

I would say the that the tone of Columbus' letters
represents excitement and pure confidence.  Part of this is manufactured by Columbus
himself.  He immediately sets out to write letters to officials in Spain to justify and
cost of his current expedition and future voyages. He has to create a general mood or
feeling of conquest and success because his ability to finance further support for his
endeavors hangs in the balance of what he did on this one.  Given the fact that the
letters are written to high ranking Spanish monarchy officials, it makes sense that he
would create a tone of excitement and the sense of wonder about his accomplishment. Many
believed him.  Columbus' letters and diaries were big selling literary products of the
time period precisely because it embodied the wonder of exploration that was so
intrinsic to the context in which Columbus lived and wrote.  It is here where the tone
has to be positive and overtly optimistic, never acknowledging failure of any kind or
any possible misgivings.  Such a tone is what helped create the narrative for so long
about the Age of Exploration, and Columbus, in particular.