The War of 1812 had significant implications for the United States, primarily strengthening national identity and independence. The conflict arose from issues such as trade restrictions, impressment of American sailors, and British support for Native American resistance against American expansion. Despite no territorial changes, the war fostered a sense of unity, particularly following the successful defense of Fort McHenry, which inspired "The Star-Spangled Banner." The war also contributed to the decline of the Federalist Party and encouraged a period of national growth and expansion known as the "Era of Good Feelings."