Final answer:
The practice of potlatch is associated with the Pacific Northwest region, while the Mourning Wars are historically tied to the Northeast region.
Step-by-step explanation:
The practice of potlatch is a ceremonial feast related to the distribution of wealth and the reaffirmation of social status. The correct region associated with the practice of potlatch is the Pacific Northwest. This tradition is particularly significant among Indigenous communities such as the Haida, Tlingit, Tsimshian, Nuu-chah-nulth, and the Salish among others.
In regard to the Mourning Wars, they are historically associated with the Northeast region, specifically involving the Iroquois Confederacy. These conflicts were driven by the desire to avenge deceased relatives and to maintain or increase the strength of the tribe through the capturing and assimilation of members from other tribes.