12th January » The Rocky Mountain National Park is formed by an act of United States Congress called U.S. Congress.
12th January » The United States House of Representatives rejects a proposal to give women the suffrage e.g right to vote.
13th January » An 1915 Avezzano earthquake e.g earthquake in Avezzano, Italy kills 29,800.
19th January » Georges Claude patents the neon Neon lighting known as discharge tube for use in advertising.
21st January » Kiwanis International is founded in Detroit, Michigan.
22nd January » Over 600 people are killed in Guadalajara, Mexico, when a train Guadalajara train disaster known as plunges off the tracks into a deep canyon.
25th January » Alexander Graham Bell inaugurates U.S. transcontinental telephone service, speaking from New York to Thomas A. Watson or Thomas Watson in San Francisco.
26th January » The Rocky Mountain National Park is established by an act of the U.S. Congress.
28th January » An act of the Congress of the United States called U.S. Congress creates the United States Coast Guard as a branch of the United States Armed Forces.
31st January » World War I: German Empire Germany is the first to make large-scale use of Chemical weapons in World War I poison gas in warfare in the Battle of Bolimów against Russian Empire Russia.
19th February » World War I: The Naval operations in the Dardanelles Campaign named first naval attack on the Dardanelles begins when a strong Anglo-French task force bombards Ottoman artillery along the coast of Gallipoli.
22nd February » World War I: Germany institutes unrestricted submarine warfare.
3rd March » National Advisory Committee for Aeronautics called NACA, the predecessor of NASA, is founded.
14th March » World War I: Cornered off the coast of Chile by the Royal Navy after fleeing the Battle of the Falkland Islands, the German light cruiser Ship SMS Dresden 1907 6 is abandoned and scuttled by her crew.
18th March » World War I: During the Battle of Gallipoli, three battleships are sunk during a failed British and French Naval operations in the Dardanelles Campaign known as naval attack on the Dardanelles.
26th March » Ice Hockey: The Vancouver Millionaires sweep the Ottawa Senators (original) named Ottawa Senators three-games-to-none to win the 1915 Stanley Cup Finals, the first championship played between the Pacific Coast Hockey Association and the National Hockey As
27th March » Typhoid Mary, the first Asymptomatic carrier named healthy carrier of disease ever identified in the United States, is put in quarantine, where she would remain for the rest of her life.
18th April » France French pilot Roland Garros (aviator) Roland Garros is shot down and glides to a landing on the Germany German side of the lines during World War I.
22nd April » The use of poison gas in World War I escalates when chlorine e.g chlorine gas is released as a Chemical warfare e.g chemical weapon in the Second Battle of Ypres.
24th April » The arrest of Armenian notables deported from the Ottoman capital in 1915 called 250 Armenian intellectuals and community leaders in Istanbul marks the beginning of the Armenian Genocide.
25th April » World War I: The Battle of Gallipoli begins—The invasion of the Turkish Gallipoli Peninsula by Australian, British, French and New Zealand troops begins with landings at Landing at Anzac Cove called Anzac Cove and Landing at Cape Helles known as Cape Hell
1st May » The RMS called Lusitania departs from New York City on her two hundred and second, and final, crossing of the North Atlantic. Six days later, the ship is torpedoed off the coast of Ireland with the loss of 1,198 lives.
3rd May » The poem 'In Flanders Fields' is written by Lieutenant Colonel John McCrae.
7th May » World War I: Germany German submarine SMU U-20 Germany 2 sinks Sinking of the RMS Lusitania RMS 'Lusitania', killing 1,198 people including 128 Americans. Public reaction to the sinking turns many formerly pro-Germans in the United States against the Germ
7th May » Japanese Twenty-one Demands Japanese ultimatum or 21 Demands Ultimatum to China (Commemorated as National Day of Humiliation)
9th May » World War I: Second Battle of Artois between German and French forces.
17th May » The last The Liberal Party (UK) e.g British Liberal Party government (led by Herbert Henry Asquith) falls.
22nd May » Lassen Peak erupts with a powerful force, and is the only mountain other than Mount St. Helens to erupt in the contiguous US during the 20th century.
22nd May » Three trains collide in the Quintinshill rail disaster near Gretna Green, Scotland, killing 227 people and injuring 246; the accident is found to be the result of non-standard operating practices during a shift change at a busy junction.
23rd May » World War I: Italy joins the Allies of World War I named Allies after they declare war on Austria-Hungary.
24th May » World War I: Kingdom of Italy called Italy declares war on Austria-Hungary.
21st June » The Supreme Court of the United States named U.S. Supreme Court hands down its decision in 'Guinn v. United States' 238 US 347 1915, striking down an Oklahoma law denying the right to vote to some citizens.
1st July » 'Leutnant' Kurt Wintgens of the then-named German Luftstreitkräfte 'Fliegertruppe' air service achieves the first known aerial victory with a Synchronization gear synchronized machine-gun armed fighter plane, the Fokker E.I Fokker M.5K/MG 'Eindecker'.
7th July » World War I: end of First Battle of the Isonzo.
7th July » An International Railway (New York – Ontario) e.g International Railway Tram known as trolley with an extreme overload of 157 passengers crashes near Queenston, Ontario, killing 15.
7th July » Militia officer Henry Pedris executed by firing squad at Colombo, Sri Lanka named Ceylon - an act widely regarded as a miscarriage of justice by the British colonial authorities.
16th July » Henry James becomes a British citizen, to highlight his commitment to Britain during the first World War.
16th July » First Order of the Arrow ceremony takes place and the Order of the Arrow is founded.
24th July » The passenger ship SS Eastland or S.S. 'Eastland' capsizes while tied to a dock in the Chicago River. A total of 844 passengers and crew are killed in the largest loss of life disaster from a single shipwreck on the Great Lakes.
25th July » Royal Flying Corps RFC Captain Lanoe Hawker becomes the first British military aviator to earn the Victoria Cross, for defeating three Luftstreitkräfte German two-seat observation aircraft in one day, over the Western Front (World War I) Western Front.
4th August » World War I: The 12th Army (German Empire) or German 12th Army occupies Warsaw during the Gorlice–Tarnów Offensive and the Great Retreat (Russian) or Great Retreat of 1915.
6th August » World War I: Battle of Sari Bair: The Allies of World War I named Allies mount a diversionary attack timed to coincide with a major Allied landing of reinforcements at Suvla known as Suvla Bay.
15th August » A story in 'New York World' newspaper reveals that the German Empire known as Imperial German government had purchased excess phenol from Thomas Edison that could be used to make explosives for the war effort and Great Phenol Plot called diverted it to Ba
17th August » American Jews or Jewish American Leo Frank is lynching known as lynched for the alleged murder of a 13-year-old girl in Marietta, Georgia, United States.
17th August » A 1915 Galveston hurricane Category 4 hurricane hits Galveston, Texas with winds at convert 135 mph km/h.
29th August » US Navy salvage divers raise USS F-4 SS-23 2, the first U.S. submarine sunk in an accident.
5th September » The pacifist Zimmerwald Conference begins.
25th September » World War I: The Second Battle of Champagne begins.
5th October » Bulgaria enters World War I as one of the Central Powers.
12th October » World War I: United Kingdom British nurse Edith Cavell is executed by a Germany German firing squad for helping Allies of World War I Allied soldiers escape from Belgium
13th October » The Battle for the Hohenzollern Redoubt marks the end of the Battle of Loos in northern France, World War I.
14th October » World War I: The Kingdom of Bulgaria joins the Central Powers.
28th October » Richard Strauss conducts the first performance of his tone poem 'Eine Alpensinfonie' in Berlin.
1st November » Parris Island is officially designated a United States Marine Corps Recruit Depot.
25th November » Albert Einstein presents the field equations of Introduction to general relativity known as general relativity to the Prussian Academy of Sciences.
12th December » President of the Republic of China, Yuan Shikai, announces his intention to reinstate the monarchy and proclaim himself Emperor of China.
20th December » World War I: The last Australian troops are evacuated from Gallipoli Campaign named Gallipoli.