1)Why is the primary source below important for historians or researchers to notice?2) why was the primary source? below written?

Primary Source 1: Translation of the Columbus letter (Basel, 1494) From: Osher Map Library - Smith Center for Cartographic Education | The following document w originally written in Latin by Christopher Columbus in 1493 to publicize his voyage. It has been adapted from the original text into paragraphs. On the thirty-third day after I departed, I came to the Indian sea, where I found many island inhabited by men...all which I took possession for our most fortunate king (King Ferdinand)... All these people lack, as I said above, every kind of iron; they are also without weapons, which indeed are unknown; nor are they competent to use them, not on account of deformity of body, for they are well formed, but because they are timid and full of fear... when I sent two or three of my men to some of the villages, that they might speak with the natives, and as soon as they saw our men approaching, they would quickly take flight. And this was not because any hurt or injury had been inflicted on any one of them, for to everyone whom I visited and with whom I was able to converse, I distributed whatever I had, cloth and many other things, no return being made to me... They show greater love for all others than for themselves; they give valuable things... being satisfied even with a very small return, or with nothing; however, I forbade that things so small and of no value should be given to them, such as pieces of plates, dishes, and glass, likewise keys and shoelace tips although if they were to obtain these, it seemed to them like getting the most beautiful jewels in the world. It happened, indeed, that a certain sailor obtained in exchange for a shoelace tips as much worth of gold as would equal three golden coins; and likewise other things for articles of very little value, especially for new silver coins, and for some gold coins, to obtain which they gave whatever the seller desired, as for instance an ounce and a half and two ounces of gold, or thirty and forty pounds of cotton, with which they were already acquainted. They also traded cotton and gold for pieces of bows, bottles, jugs and jars, like persons without reason, which I forbade because it was very wrong; and I gave to them many beautiful and pleasing things that I had brought with me, no value being taken in exchange... ... They firmly believe that all strength and power, and in fact all good things are in heaven, and that I had come down from thence with these ships and sailors; and in this belief I was received there after they had put aside fear. ..... They are coming with me now, yet always believing that I descended from heaven