The history of the United States Navy divides into two major periods: the "Old Navy", a small but respected force of sailing ships that was also notable for innovation in the use of ironclads during the American Civil War, and the "New Navy", the result of a modernization effort that began in the 1880s and made it the largest in the world by the 1920s.The United States Navy claims 13 October 1775 as the date of its official establishment, when the Second Continental Congress passed a resolution creating the Continental Navy.
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