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
British home army in the First World War an invasion, going so far as to inform the War Office in February that the loss of so many of his troops to the field army overseas absolved him of the responsibility for home defence. Admiral John Fisher, a former First Sea Lord, was concerned about the increasing U-boat menace, and believed that the German war leader, Field Marshall Paul von Hindenburg, would be willing to risk the High Seas Fleet in an invasion attempt. The Admiralty regarded the risk as possible rather than probable, and guaranteed to be able to disrupt an enemy fleet within 32 to 36 hours