Annotation	Page	Subject	Links
21.1	658	Had Grown in Population and Territory	Text - Frederick Jackson Turner: The Significance of the Frontier in American History (1893).
21.2	667	War in Cuba	Video - Spanish-American War video consisting of excerpts from War correspondents (1898) Video - U.S. Battleship Indiana (1898) Video - Vizcaya under full headway (1898) Video - Roosevelt's Rough Riders (1898).
21.3	672	American Armed Forces	Image - Advance on Left of American lines. Signal Corps Extending Telegraph Lines from Trenches. Flags Displayed to Indicate to the Navy Process of the Advance. (August 1898). Image - Our Boys Entrenched Against the Filipinos. (1899). Image - Group of Signal Men in China. (1900). Image - Army airplane No. 75, Camp El Valle, Mexico (September, 1916). Image - USS Connecticut Running Speed Trials off the Maine coast (1906). Image - USS Monadnock, Off the Mare Island Navy Yard, CA, June 1898, Ready for her Voyage to the Philippines. The Old Monitor USS Camanche (1864-1899) is Visible Beyond Monadnock's After Turret. (1898). Image - Young Men Wanted for the United States Navy. (1908)
21.4	675	Panama Canal	Video - Excerpts from The story of the Panama Canal (1927) from the Theodore Roosevelt Film Archive.

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