During this decade, the D-notice system was formalized to ward off newspapers publishing on sensitive topics. Times editor Geoffrey Dawson refused to publish the anti-war Lansdowne Letter during this decade. The Maurice Debate (-5[1])took place during this decade and influenced whether or not candidates received the impactful coalition coupon. The ensuing (*) “coupon election” during this decade gave Sinn Féin (“shin fain”) their first Irish majority and split the Liberal Party led by H. H. Asquith. (-5[1])The Parliament Act was passed during this decade after the House of Lords vetoed the previous decade’s “People’s Budget.” (10[1])The Royal Air Force was formed in this decade during the David Lloyd George ministry. For 10 points, name this decade during which a U-boat sunk the Lusitania. ■END■ (10[2])