 By 1806 the United States was becoming increasingly hostile to the British Empire; relations between the two nations continued to deteriorate until war finally broke out in 1812.The United States had grievances at British violations of American sovereignty (their navy was impressing US sailors), restriction of American trade by Britain, and an American desire to gain territory by invading and annexing the poorly defended British North American colonies.American grievances included the impressment of American sailors by the Royal Navy, the blockade of French ports, and a belief that the British were inciting American Indians to attack U.S. settlements on the western frontier.