Palestine Campaign – Battle of Romani: British Imperial troops secure victory over a joint Ottoman-German force. August 7 – WWI: Portugal joins the Allies. French and British forces make an unopposed entry into German-controlled Togoland; on December 27 the country is partitioned between the two allies. August 9 – Lassen Volcanic National Park is established in California. August 15 – Club Atlas is founded as an association football club in Guadalajara, Mexico, by English-educated players. August 16 – The Migratory Bird Treaty between Canada and the United States is signed. August 17 (August 4 O.S.) – WWI: The Treaty of Bucharest is signed secretly between Romania and the Entente Powers, stipulating the conditions under which Romania agrees to join the war on their side, particularly territorial promises in Austria-Hungary. August 21 – WWI: Peru declares neutrality. August 25 – U.S. President Woodrow Wilson signs legislation, creating the National Park Service. August 27 – WWI: The Kingdom of Romania declares war on the Central Powers, entering the war on the side of the Allies. August 28 – WWI: Germany declares war on Romania. Italy declares war on Germany. August 29 – The United States passes the Philippine Autonomy Act. August 30 – The crew of the Imperial Trans-Antarctic Expedition's is rescued from Elephant Island. September September 1 – Bulgaria declares war on Romania, going on to take Dobruja. September 2 – WWI: British pilot Leefe Robinson becomes the first to shoot down a German airship over Britain. September 4 – WWI: East African Campaign – Dar es Salaam surrenders to British Empire forces, securing them control of the Central Line of railway through German East Africa. September 5 – D. W. Griffith's film Intolerance: Love's Struggle Through the Ages is released in the United States. September 6 – The first true self-service grocery store, Piggly Wiggly, is founded in Memphis, Tennessee, by Clarence Saunders, opening 5 days later. September 11 – A mechanical failure causes the central span of the Quebec Bridge, a cantilever-type structure, to crash into the Saint Lawrence River for the second time, killing 13 workers. September 13 – Mary, a circus elephant, is hanged in the town of Erwin, Tennessee for killing her handler, Walter "Red" Eldridge. September 15–22 – WWI – Battle of Flers–Courcelette, France: The battle is significant for the first use of the tank in warfare; also for the debut of the Canadian and