United States in World War I 11 approximately 10,000 fresh soldiers were arriving in France daily. In 1917, Congress gave US citizenship to Puerto Ricans when they were drafted to participate in World War I, as part of the Jones Act. In the end, Germany miscalculated the United States' influence on the outcome of the conflict, believing it would be many more months before US troops would arrive and overestimating the effectiveness of U-boats in slowing the American buildup. The United States Navy sent a battleship group to Scapa Flow to join with the British Grand Fleet, destroyers to Queenstown, Ireland and submarines to help guard
Romanian Black Sea Fleet during World War I sea-going gunboat "Grivița" and the Romanian Navy's sole proper minelayer, "Alexandru cel Bun". The Black Sea Fleet was neglected for a long-time by the Romanian Command. Its warships were all built between 1880 and 1888, while the Romanian Danube Flotilla was equipped with modern vessels built as late as 1908. The protected cruiser "Elsiabeta" was converted to an anti-aircraft cruiser after the start of the war, her four 120 mm main guns being landed and her four 75 mm secondary guns being modified for anti-aircraft fire. She was also armed with four machine guns and four 356 mm (12 inch)