Final answer:
The governments of Native American tribal nations have differing stances on the enlargement of monuments, with some supporting and some opposing the enlargement. The reasons for opposition include concerns about local control and potential negative impacts on local economies.
Step-by-step explanation:
The governments of the Native American tribal nations in the area have differing stances on the enlargement of monuments. Some tribes support and some oppose the enlargement to the size before Trump took office, while others oppose it because it may depress their local economies. There is no unified stance taken by all tribal governments, as each tribe has their own unique perspective and priorities.