Final answer:
Columbus' bias in his letter and journal is evident in his portrayal of the land and its inhabitants and his goals.
Step-by-step explanation:
The bias inherent in Columbus' letter and journal can be seen through his goals and perceptions of the land and its inhabitants. Columbus believed he had reached Asia and wanted to impress his sponsors and be sent back again, so he portrayed the discovered lands as fertile, beautiful, and abundant in gold. He referred to the natives as subordinate and less civilized compared to Europeans. By reading between the lines, we can infer that Columbus was driven by the desire for wealth, glory, and to continue the fight against Islam.