Final answer:
The NCAI's mission is to monitor policies and educate the public to protect Indigenous rights, while AIM focuses on renewing spirituality to strengthen resolve against harmful policies.
Step-by-step explanation:
The mission of the National Congress of American Indians (NCAI) is to monitor federal policies and educate the public regarding issues that affect Indigenous peoples in the United States. It strives to preserve rights that have been established under treaties and agreements with the U.S. government. The American Indian Movement (AIM) similarly has a purpose centered around Indigenous peoples' rights and welfare, specifically aiming to revitalize spirituality among Native communities, which AIM believes will provide the resolve needed to address and reverse harmful policies enacted by the United States and other colonial governments in the Americas.