Answer:
Cortes describes the similar characteristics of the new land he "has discovered"(central america) and compares it to his homeland, Spain, finding them so similar, asks the king that these new lands that will be of the Spanish crown be called "New Spain" by the before mentioned.
It can also be understood that he communicates the discovery of new lands, of which the king grants him titles of property and rights, so it can also be seen that he claims his share of what was agreed for the expedition.