• Declarations of war have never been a constitutional requirement for military action abroad. The United States has used force abroad more than 130 times, but has only declared war five times - the War of 1812, the Mexican-American War, the Spanish-American War, and World Wars I and II.

    John Yoo: Declarations of war have never been a constitutional requirement for military action abroad. The United States has used force abroad more than 130 times, but has only declared war five times - the War of 1812, the Mexican-American War, the Spanish-American War, and World Wars I and II.
    Source: www.guernicamag.com