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Technology
French Nieuport 17 C.1 fighter, 1917The First World War began as a clash of 20th century technology and 19th century tactics, with inevitably large casualties. By the end of 1917, however, the major armies, now numbering millions of men, had modernized and were making use of telephone, wireless communication, armored cars, tanks, and aircraft. Infantry formations were reorganized, so that 100-man companies were no longer the main unit of maneuver. Instead, squads of 10 or so men, under the command of a junior NCO, were favored. Artillery also underwent a revolution.

Germany was far ahead of the Allies in utilizing heavy indirect fire. She employed 150 and 210 mm howitzers in 1914 when the typical French and British guns were only 75 and 105 mm. The British had a 6 inch (152 mm) howitzer, but it was so heavy it had to be assembled for firing. Germans also fielded Austrian 305 mm and 420 mm guns, and already by the beginning of the war had inventories of various calibers of Minenwerfer ideally suited for trench warfare.

Russian Ilya Muromets the world's first strategic bomber, 1913Much of the combat involved trench warfare, where hundreds often died for each yard gained. Many of the deadliest battles in history occurred during the First World War. Such battles include Ypres, the Marne, Cambrai, the Somme, Verdun, and Gallipoli. The Haber process of nitrogen fixation was employed to provide the German forces with a constant supply of gunpowder, in the face of British naval blockade. Artillery was responsible for the largest number of casualties and consumed vast quantities of explosives. The large number of head-wounds caused by exploding shells and fragmentation forced the combatant nations to develop the modern steel helmet, led by the French, who introduced the Adrian helmet in 1915. It was quickly followed by the Brodie helmet, worn by British Imperial and U.S. troops, and in 1916 by the distinctive German Stahlhelm, a design, with improvements, still in use today.

There was chemical warfare and small-scale strategic bombing, both of which were outlawed by the 1907 Hague Conventions. Both were of limited tactical effectiveness.

The widespread use of chemical warfare was a distinguishing feature of the conflict. Gases used included chlorine, mustard gas and phosgene. Only a small proportion of total war casualties were caused by gas. Effective countermeasures to gas attacks were quickly created, such as gas masks.

The most powerful land-based weapons were railway guns weighing hundreds of tons apiece. These were nicknamed Big Berthas, even though the namesake was not a railway gun. Germany developed the Paris Gun, able to bombard Paris from over 100 km (60 mi), though shells were relatively light at 94 kilograms (210 lb). While the Allies had railway guns, German models severely out-ranged and out-classed them.

Fixed-wing aircraft were first used militarily by the Italians in Libya 23 October 1911 during the Italo-Turkish War for reconnaissance, soon followed by the dropping of grenades and aerial photography the next year. By 1914 the military utility was obvious. They were initially used for reconnaissance and ground attack. To shoot down enemy planes, anti-aircraft guns and fighter aircraft were developed. Strategic bombers were created, principally by the Germans and British, though the former used Zeppelins as well.

Towards the end of the conflict, aircraft carriers were used for the first time, with HMS Furious launching Sopwith Camels in a raid against the Zeppelin hangars at Tondern in 1918.

Armoured cars, German U-boats (submarines) were deployed after the war began. Alternating between restricted and unrestricted submarine warfare in the Atlantic, they were employed by the Kaiserliche Marine in a strategy to deprive the British Isles of vital supplies. The deaths of British merchant sailors and the seeming invulnerability of U-boats led to the development of depth charges (1916), hydrophones (passive sonar, 1917), blimps, hunter-killer submarines (HMS R-1, 1917), ahead-throwing weapons, and dipping hydrophones (the latter two both abandoned in 1918). To extend their operations, the Germans proposed supply submarines (1916). Most of these would be forgotten in the interwar period until World War II revived the need.

Trenches, machineguns, air reconnaissance, barbed wire, and modern artillery with fragmentation shells helped bring the battle lines of World War I to a stalemate. The British sought a solution with the creation of the tank and mechanised warfare. The first tanks were used during the Battle of the Somme on 15 September 1916. Mechanical reliability became an issue, but the experiment proved its worth. Within a year, the British were fielding tanks by the hundreds and showed their potential during the Battle of Cambrai in November 1917, by breaking the Hindenburg Line, while combined arms teams captured 8000 enemy soldiers and 100 guns. Light automatic weapons also were introduced, such as the Lewis Gun and Browning automatic rifle.

Manned observation balloons, floating high above the trenches, were used as stationary reconnaissance platforms, reporting enemy movements and directing artillery. Balloons commonly had a crew of two, equipped with parachutes.  In the event of an enemy air attack, the crew could parachute to safety. At the time, parachutes were too heavy to be used by pilots of aircraft (with their marginal power output) and smaller versions would not be developed until the end of the war; they were also opposed by British leadership, who feared they might promote cowardice.  Recognized for their value as observation platforms, balloons were important targets of enemy aircraft. To defend against air attack, they were heavily protected by antiaircraft guns and patrolled by friendly aircraft; to attack them, unusual weapons such as air-to-air rockets were even tried. Blimps and balloons contributed to air-to-air combat among aircraft, because of their reconnaissance value, and to the trench stalemate, because it was impossible to move large numbers of troops undetected. The Germans conducted air raids on England during 1915 and 1916 with airships, hoping to damage British morale and cause aircraft to be diverted from the front lines. The resulting panic took several squadrons of fighters from France.

Johnson's Nieuport 11 armed with rockets for attacking observation balloons   Another new weapon, flamethrowers, were first used by the German army and later adopted by other forces. Although not of high tactical value, they were a powerful, demoralizing weapon and caused terror on the battlefield. It was a dangerous weapon to wield, as its heavy weight made operators vulnerable targets.

Trench railways evolved to supply the enormous quantities of food, water, and ammunition required to support large numbers of soldiers in areas where conventional transportation systems had been destroyed. A trench railway system was included in construction of the Maginot Line, but internal combustion engines and improved traction systems for wheeled vehicles rendered trench railways obsolete within a decade.

Opposition to the war
The trade union and socialist movements had long voiced their opposition to a war, which they argued, meant only that workers would kill other workers in the interest of capitalism. Once war was declared, however, many socialists and trade unions backed their governments. Among the exceptions were the Bolsheviks, the Socialist Party of America, and the Italian Socialist Party, and individuals such as Karl Liebknecht, Rosa Luxemburg and their followers in Germany. There were also small anti-war groups in Britain and France. Other opposition came from conscientious objectors - some socialist, some religious - who refused to fight. In Britain 16,000 people asked for conscientious objector status. Many suffered years of prison, including solitary confinement and bread and water diets. Even after the war, in Britain many job advertisements were marked "No conscientious objectors need apply". The Sedition Act of 1918 made any statements deemed "disloyal" a federal crime. Publications at all critical of the government were removed from circulation by postal censors.

Aftermath
The Newfoundland Memorial at Beaumont HamelNo other war had changed the map of Europe so dramatically — four empires disappeared: the German, Austro-Hungarian, Ottoman and the Russian. Four defunct dynasties, the Hohenzollerns, the Habsburg, Romanovs and the Ottomans together with all their ancillary aristocracies, all fell after the war. Belgium was badly damaged, as was France with 1.4 million soldiers dead, not counting other casualties. Germany and Russia were similarly affected. The war had profound economic consequences. In addition, a major influenza epidemic that started in Western Europe in the latter months of the war, killed millions in Europe and then spread around the world. Overall, the Spanish flu killed at least 50 million people.

Later conflicts
The end of World War I set the stage for other world conflicts, some of which are continuing into the 21st century. Out of German discontent with the still controversial Treaty of Versailles, Adolph Hitler was able to gain popularity and power. World War II was in part a continuation of the power struggle that was never fully resolved by the First World War; in fact, it was common for Germans in the 1930s and 1940s to justify acts of international aggression because of perceived injustices imposed by the victors of the First World War.

The birth of Israel and the roots of the continuing Israeli-Palestinian Conflict are partially found in the unstable power dynamics of the Middle East which were born at the end of World War I. Previous to the end of fighting in the war, the Ottoman Empire had maintained a modest level of peace and stability throughout the Middle East. With the end of the war and the fall of Ottoman government, power vacuums developed and conflicting claims to land and nationhood began to emerge.  Sometimes after only cursory consultation with the local population, the political boundaries drawn by the victors of the First World War were quickly imposed, and in many cases are still problematic in the 21st century struggles for national identity. While the dissolution of the Ottoman Empire at the end of World War I was a pivotal milestone in the creation of the modern political situation of the Middle East, including especially the Arab-Israeli conflict, the end of Ottoman rule also spawned lesser known disputes over water and other natural resources.

Peace treaties
After the war, the Allies imposed a series of peace treaties on the Central Powers. The 1919 Versailles Treaty, which Germany was kept under blockade until she signed, ended the war. It declared Germany responsible for the war and required Germany to pay enormous war reparations and awarding territory to the victors. Unable to pay them with exports (a result of territorial losses and postwar recession), she did so by borrowing from the United States, until the reparations were suspended in 1931. The "Guilt Thesis" became a controversial explanation of events in Britain and the United States. The Treaty of Versailles caused enormous bitterness in Germany, which nationalist movements, especially the Nazis, exploited.  The treaty contributed to one of the worst economic collapses in German history, sparking runaway inflation in the 1920s.

The Ottoman Empire was to be partitioned by the Treaty of Sèvres in 1920. The treaty, however, was never ratified by the Sultan and was rejected by the Turkish republican movement. This led to the Turkish Independence War and, ultimately, to the 1923 Treaty of Lausanne.

Austria-Hungary was also partitioned, largely along ethnic lines. The details were contained in the Treaty of Saint-Germain and the Treaty of Trianon.

Poland reemerged as an independent country, after more than a century. Yugoslavia and Czechoslovakia were entirely new nations. Russia became the Soviet Union and lost Finland, Estonia, Lithuania and Latvia, which became independent countries. The Ottoman Empire was soon replaced by Turkey and several other countries in the Middle East.

Some people think that the Allies opened the way to more colonization with their policy, because with it the Allies could colonise territories owned by the Ottoman Empire and the German Empire, by making them independent.

Postwar colonization in the Ottoman Empire led to many future problems still unresolved today. Conflict between mostly Jewish colonists and the existing, mostly Muslim, population intensified, probably exacerbated by the Holocaust, which stimulated Jewish migration and encouraged the new immigrants to fight for survival, a homeland, or both. However, any new homeland for immigrants would cause hardships for the existing population, especially if the former displaced the latter. The United Nations partitioned Palestine in 1947 with Jewish but not Arab and Muslim approval. After the creation of the state of Israel, a series of wars broke out between Israel and its neighbors, Egypt, Jordan, and Syria, in addition to unrest from the Palestinian population and terrorist activity by Palestinians and others reaching to Iran and beyond. Lasting peace in the region remains an elusive goal almost a century later.

After the Battle of Vimy Ridge, where the Canadian divisions fought together for the first time as a single corps, Canadians began to refer to theirs as a nation "forged from fire". Having succeeded on the same battleground where the "mother countries" had previously faltered, they were for the first time respected internationally for their own accomplishments. Having entered the war as a Dominion of the British Empire, by its end Canada emerged as a fully independent nation. While the other Dominions were represented by Britain, Canada was an independent negotiator and signatory of the Versailles Treaty. Canadians commemorate the war dead on Remembrance Day. In French Canada, however, the Conscription Crisis left bitterness in its wake.

Social trauma
The experiences of the war led to a collective trauma for all participating countries.
The optimism of the 1900s was gone and those who fought in the war became known as the Lost Generation. For the next few years, much of Europe mourned. Memorials were erected in thousands of villages and towns. The soldiers returning home from World War I suffered greatly from the horrors they had witnessed. Many returning veterans suffered from post-traumatic stress disorder, called shell shock at the time.

The social trauma caused by years of fighting manifested itself in different ways. Some people were revolted by nationalism and its results, and so they began to work toward a more internationalist world, supporting organizations such as the League of Nations. Pacifism became increasingly popular. Others had the opposite reaction, feeling that only strength and military might could be relied upon in a chaotic and inhumane world. Anti-modernist views were an outgrowth of the many changes taking place in society. The rise of Nazism and fascism included a revival of the nationalist spirit and a rejection of many post-war changes. Similarly, the popularity of the Dolchstosslegende ("stab-in-the-back legend") was a testament to the psychological state of defeated Germany and was a rejection of responsibility for the conflict. The conspiracy theory of betrayal became common and the German public came to see themselves as victims. The Dolchstosslegende's popular acceptance in Germany played a significant role in the rise of Nazism. A sense of disillusionment and cynicism became pronounced, with nihilism growing in popularity. This disillusionment for humanity found a cultural climax with the Dadaist artistic movement. Many believed the war heralded the end of the world as they had known it, including the collapse of capitalism and imperialism. Communist and socialist movements around the world drew strength from this theory and enjoyed a level of popularity they had never known before. These feelings were most pronounced in areas directly or harshly affected by the war.