The second war for independence refers to the War of 1812, a conflict fought between the United States and Great Britain from 1812 to 1815. This war was significant as it arose from issues like British restrictions on American trade and the impressment of American sailors, and it represented a struggle for national sovereignty and self-determination. The conflict is often seen as a pivotal moment in defining American identity and fostering a sense of unity among the states, leading into a period known as the Era of Good Feelings.