The Treaty of Lausanne is signed between Turkey and the countries that formed the Allied Powers in the First World War.
The Treaty of Versailles takes effect.
After nearly four and a half years of cataclysmic conflict, World War I ended.
American Army Corporal Alvin York and seven men attacked a major German gun nest on their own during World War I.
The Red Baron is killed.
Third Battle of Ypres begins in Flanders
Dutch exotic dancer Mata Hari was put on trial in Paris after being accused of being a spy.
Registration of US men aged between 21 and 31 began for troops for WWI.
The US Congress passed Selective Service Act.
The US declared war against Germany and its Central Powers Alliance in World War I.
Battle of the Somme ends.
During World War I, as a soldier, Adolf Hitler was injured by a grenade blast.
Tanks were used for the first time in battle, at the Battle of the Somme, during World War I.
The Battle of Somme began.
Germany and its World War I allies become the first countries to use daylight saving time (DST).
During WWI, The Battle of Gallipoli concluded with an Ottoman Empire victory when the last Allied forces were evacuated from the Peninsula.
Medical researcher Oswald Hope Robertson performed the first-ever blood transfusion using stored and refrigerated blood.
The last Australian troops were evacuated from Gallipoli during World War I.
A German U-Boat sinks the RMS Lusitania.
The Treaty of London was signed by Italy, Britain, France, and Russia.
The US National Advisory Committee for Aeronautics was founded as an emergency measure during WWI.
Unofficial ceasefires sprang up across World War I's Western Front.
First Battle of Ypres.
The First Battle of the Marne began during World War I.
During World War I, Japan officially declared war on Germany.
President Woodrow Wilson issued a Proclamation of Neutrality.
The first British troops arrived in France during World War I.
Britain declares war on Germany.
The United States of America declared neutrality at the beginning of World War I.
Germany declared war on France and sent its first wave of troops to Belgium to start the attack.
Franz Ferdinand and his wife Sophie were assassinated, ultimately causing World War I.
France and the United Kingdom sign the Entente cordiale.
