The primary cause of the War of 1812 between the United States and Britain was rooted in maritime conflicts and trade restrictions. Tensions escalated due to Britain's interference with American shipping, including the impressment of American sailors into the British Navy, which violated U.S. sovereignty. British support for Native American resistance against American expansion in the Northwest Territory also contributed to the conflict. The U.S. declared war in 1812, seeking to assert its rights and independence. This war had significant ramifications for national identity and U.S.-British relations, culminating in the Treaty of Ghent in 1814, which restored pre-war borders.