Final answer:
De Las Casas provides a detailed geographic description of the kingdom to highlight the extent of the Spanish brutality and mistreatment of Native Americans.
Step-by-step explanation:
The effect of de Las Casas providing such a detailed geographic description of the kingdom in this excerpt is to highlight the extent of the Spanish brutality and mistreatment of Native Americans.
By describing the kingdom in detail, de Las Casas emphasizes the vastness of the destruction and the suffering inflicted upon Native Americans by the Spanish colonizers.
This description serves as evidence to support de Las Casas's argument against the encomienda system and the need for reforms.