Final answer:
The War of 1812 heightened tensions between Native Americans and white settlers by removing Native American allies (the British) and leading to increased encroachment on Indigenous lands, further violence, and forced relocations.
Step-by-step explanation:
The War of 1812 magnified the conflict between Native Americans and white settlers by eliminating the British as an ally and potential buffer for Native tribes. The war ended with the Treaty of Ghent, which did not address Native American interests, and essentially returned territories to their pre-war controllers without recognizing Indigenous claims. As U.S. expansionism grew following the surge of national pride and sense of sovereignty obtained from what was perceived as an American victory, white settlers moved westward. Native victories, such as those achieved in the Northwest by leaders like Tecumseh, had been pivotal. Still, his death and the loss of British support left Indigenous nations vulnerable to U.S. pressures.
This resulted in increased violence on the frontier, as settlers encroached on Native lands, leading to the Indian Wars, government interventions, and forced relocations of Native peoples to reservations. The end of the War of 1812 intensified the so-called "Indian problem" as the United States turned its attention to Western expansion, leading to greater governmental involvement and ultimately transformational impacts on tribal cultures.