6. The _______ is the equal right of Americans and Filipinos to use the natural resources, land, and waters of the Philippines.

The term that fills the blank is "Pari passu." This phrase refers to the equal rights of Americans and Filipinos to utilize the natural resources, land, and waters of the Philippines. This concept is rooted in agreements and historical contexts regarding shared access to the country's resources, emphasizing fairness and equality in resource management between the two nations.

This principle was notably outlined during the period of American influence in the Philippines, along with the establishment of certain rights through treaties and laws that acknowledged the sovereign rights of Filipinos alongside the interests of American entities. Hence, it underscores a collaborative approach to resource use and sustainability in the nation's context.