Final answer:
The Northwest Ordinance of 1787 recognized Indian land claims and prohibited slavery in the Northwest Territory while allowing for the return of fugitive slaves and setting forth a system for orderly expansion.
Step-by-step explanation:
The Northwest Ordinance of 1787 addressed Indian issues by acknowledging that Indians had valid land claims unless taken in just and lawful wars sanctioned by Congress. As for slavery, the ordinance prohibited it in the Northwest Territory, except as punishment for a crime, and allowed for the return of fugitive slaves. It also laid out a blueprint for how the nation would expand and regulate new territories, calling for expansion with honor toward the Indian population.