Answer:
the growth of Christianity among European peoples during the medieval period.
Explanation:
From the letter written by Christopher Columbus to King Ferdinand and Queen Isabella of Spain, it can be inferred that Mr. Columbus was asking for aid from the Spanish government to assist in his voyage for an expedition and in the second paragraph of the letter, he asks the Christians to rejoice because "our Redeemer has given this victory to our . . .King" and that they should exalt the Holy Trinity "for the exaltation of turning so many peoples to
our Holy Faith" which signifies the growth of Christianity among European peoples during the medieval period.