The War of 1812 between the United States and Great Britain was caused primarily by ongoing tensions related to trade restrictions, the impressment of American sailors into the British Navy, and British support for Native American resistance against American expansion in the Northwest Territory. American frustration grew over British interference with shipping and trade during the Napoleonic Wars. Additionally, the desire for territorial expansion fueled grievances against Britain. This conflict ultimately underscored America's struggle for self-determination and solidified a sense of national identity as it fought to protect its sovereignty from British influence.