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World War One lasted for four years, from 1914 – 1918, and resulted in the deaths of millions of people.

The causes for the war were far from simple and many of the reason dated back decades.

Watch this video to find out how alliances and the assassination of Archduke Franz Ferdinand led to the outbreak of World War One.

On 28th June 1914, the heir to the powerful empire of Austria-Hungary, Archduke Franz Ferdinand, was assassinated by Serbian extremists.

By early August of 1914, many of Europe’s nations had formed themselves into political and military alliances that were preparing for war.

This assassination and the international reactions to it led to the outbreak of World War One.

However, there are a number of wider causes and factors that contributed to the war. Some date back decades before the shooting started.

These causes can be summed up by the acronym MAIN.

• Militarism
• Alliances
• Imperialism
• Nationalism

Through the 19th Century, the role of the military grew in importance and prestige for European countries.

For the British, militarism came in the form of the national pride in the strength of its navy – at the time, the strongest navy in the world.

The British Empire was the largest in the world and included nations and territories such as Canada, Australia, India, and parts of Africa. The navy was essential to the maintenance and defence of this empire.

For other nations, the size and strength of the army was a source of national pride - success in wars and battles provided glory and increased international status to the winning nation.

In the second half of the 19th Century, a series of wars were fought between the major European powers. Countries fought to gain more territory and political influence, or to defend the territory and influence they already had.

The strength of each nation’s military was the means to achieve these goals and bring greater glory to the nation.

• The Crimean War, 1853-1856, saw an alliance of British, French, and Ottoman forces against Russian territorial expansion.
• The Franco-Prussian War, 1870-71, was a territorial conflict fought by France and Germany.
• The Boer War, 1899-1902, saw Britain fight to maintain control of South Africa from rebellions in two South African states.
• The Russia-Japan War, 1904-1905, saw Russia defeated in an imperial clash over control of parts of China and Korea.

The increased importance of a strong military led to greater rivalry between European nations.

During the late 19th Century, Germany became an important power in European.

As a nation, Germany was relatively new - separate German-speaking states such as Prussia, and Hannover, had been unified as the German nation-state in 1871.

As well as being a power in Europe, Germany desired an overseas empire - just as Britain had.

The German Kaiser, Wilhelm II, was a grandson of the late Queen Victoria and had spent many of his summers visiting his grandmother in England. It was during these trips that he became inspired to build a new German Navy which would rival the British fleet.

In a sign of German intent, in 1887, work began on a canal that would cut across the territory of Denmark.

Called the Kaiser Wilhelm Canal (now known as the Kiel Canal), it allowed the German Baltic Fleet to move from their bases to the North Sea faster by avoiding the journey of sailing around Denmark.

The rapid expansion of the German navy, as well as the strength of the German army, was seen as a threat to other rival European powers such as Britain and France.

For these rivals, there was a dilemma. Should they allow German to get militarily stronger, or go to war and defeat it sooner before it was too late.

Before the outbreak of war, peace in Europe was guaranteed by a series of treaties between nation.

Usually these were alliances of two or more nations promising aid to each other if any of them should be attacked by another country.

However in the last quarter of the 19th century (1800s), old alliances were discarded and new ones were formed, creating tension between the nations of Europe.

Of all the countries in Europe, Germany required alliances to secure their borders as they were located in the middle of Europe and surrounded by nations that were hostile to their ambitions.

A unified Germany only came into existence in 1871. Before that, it had been a collection of German-speaking states.

This powerful new nation had three immediate problems:

• France – Their neighbours to the west, the French were Germany’s biggest rival for power in Europe and they had recently been at war in 1870.
• Austria-Hungary - their neighbours to the south opposed Germany’s ambition for greater power and an empire and saw them as a threat to their influence in middle European affairs.
• Russia – Germany feared that its large neighbour and rival to the east was rising in power and would soon challenge them.

Germany believed that it could defeat any one of these rivals but if two or more formed alliances against it, then they would be too powerful.

Under the leadership of the German diplomat and statesman, Otto von Bismarck, the German solution was to form alliances with these nations to stop them forming alliances with each other.

Between 1873 and 1887, Germany was in an uneasy, on-off alliance with Austria-Hungary and Russia known as the Three Emperors’ League. This was designed as a check to counter the threat of France.

When Germany’s relationship with Russia began to turn sour, Germany signed a separate alliance with Austria-Hungary in 1879 called the Dual Alliance. In 1882 this became the Triple Alliance when Italy joined.

To counter this, in 1893-4 Russia and France formed an alliance that stated that each nation would come to each other’s aid if they were attacked by Germany.

This now meant that Germany’s borders were less secure as France and Russia could no longer be considered as friendly nations.

For security, Germany had to think of what would happen if it found itself at war with both of these neighbour nations at the same time.

Watch this video to find out about the Schlieffen Plan - Germany's strategy for defeating France and Russia.

Britain chose a policy of isolation over alliances during the 19th Century. It tried to stay out of European conflict, but did have treaties with other nations.

In what would later become important, Britain had signed the Treaty of London in 1839 promising to defend the newly created state of Belgium. The treaty was also signed by all the other major European powers.

While the treaty guaranteed the independence and neutrality of Belgium, the agreement would be broken if Germany's Schlieffen Plan was ever to be put into use.

Over time, though, it became clear to British leaders that other alliances would be needed in order to protect the British Empire from rival countries.

In 1904, Britain and France signed an Entente Cordiale (Friendly Agreement) aimed at protecting both countries’ colonies in Africa.

They also agreed to naval spheres of influence:

• France would patrol the Mediterranean Sea.
• British would patrol the North Sea.

This understanding allowed Britain to move more of its fleet to the North Sea to counter the threat of the growing German Navy.

In 1907 a similar agreement was reached with Russia, this time focusing on the protection of Britain’s colonies in the Middle East and Asia.

These agreements forged the Triple Entente and brought Britain closer to European politics and more aligned with Germany's rivals, France and Russia.

However none of these agreements committed Britain to providing military support for either France or Russia in the event of a war breaking out.

Imperialism can simply be defined as extending a nation’s power or influence over other countries and in the 18th and 19th Centuries this was mainly achieved through colonisation.

At this time, the two largest colonial empires were the British Empire and the French Empire.

• The British Empire covered more than 11,400,000 square miles of territory and 390 million people
• The French Empire had amassed territory incorporating over 4,000,000 square miles and 60 million people.

Colonies were a means to project a nation’s power and influence further afield in the world.

They also allowed nations to gain a lot of wealth through the exploitation of natural resources in the colonised lands and through trade.

During the 19th Century, many European powers rushed to build up overseas empires. This led to competitions and rivalries - and in some cases military conflict.

Both France and Britain had come close to war as a result of their conflicting interests in building their empires in Africa. These disputes were resolved peacefully and ultimately lead to the signing of the 1904 Entente Cordiale.

As a newly formed nation, Germany felt that it had missed out on building an empire.

Germany was able to establish some colonies in Africa but it found that the British and French hold on the continent was too strong to break.

Instead, Germany tried to drive a wedge between Britain and France during the Morocco Crisis of 1905.

At this time, Morocco was the only country on the northern coast of Africa that remained independent, however France had been gaining influence and control over it.

The Kaiser declared his support of Morocco’s independence and also hoped to establish a German port. This would have provided the German navy with direct access to the Mediterranean Sea.

The British and French were very unhappy at the idea of this. The French resented German interference in Morocco and the British believed that the port would have threatened the strategically important British-controlled territory of Gibraltar.

An international conference was held and Germany was forced to back down.

In 1911, Germany tried for a second time to gain influence over Morocco and for a second time was humiliated and forced to back down.

These instances further solidified the Triple Entente and isolated Germany.

A simple definition of nationalism in this period is that it was ideology that emphasized loyalty, devotion, or allegiance to the nation.

At the beginning of the 20th century, nationalist feelings were beginning to rise in Europe, especially in the Austria-Hungarian Empire.

In 1867, Austria and the Kingdom of Hungary signed a treaty that created a formal union between the two states.

Both countries were ruled by the same royal family – the Hapsburgs.

Whilst other nations had empires consisting of overseas territories, Austro-Hungary’s empire was made up of European nations to its east, primarily in the Balkans.

These nations had their own languages, cultures, and traditions and, during the late 19th and early 20th century, nationalist sentiments began to grow in some of these nations.

Some, such as Bosnia, wanted independence from Austria-Hungary and were supported in their efforts by nations such as Serbia - who in turn was supported by Russia.

At the start of the 20th Century, tensions across the different territories of Austria-Hungary began to rise. A series of serious incidents threatened peace in the region:

• In 1903, the King of Serbia, his wife, and leading members of the military were assassinated. The king who replaced him was seen to be more favourable to Russia and Serbian nationalists.
• In 1908, Austria-Hungary annexed the lands of Bosnia and Herzegovina. Previously they had belonged to the Turkish Ottoman Empire.
• Between 1912 and 1913, two Balkan Wars were fought
  • In the First Balkan War, Bulgaria, Greece, Montenegro and Serbia defeated the Ottoman Empire, claiming most of empire's European territory.
  • In the Second Balkan War, Bulgaria fought against Greece and Serbia over how territory gained from the first war was divided up.

The tensions erupted on 28th June 1914 when a group of Serbian nationalists assassinated the heir to the Austria-Hungarian throne, Franz Ferdinand.

The Archduke and his wife, Sofie, were on a state visit to Sarajevo, the capital city of Bosnia and Herzegovina.

Unknown to them, a group of young Serb nationalists had arrived in the city with a plan to kill the Archduke. Their ultimate aim was to free Bosnia and Herzegovina from Austria-Hungarian control.

As the Archduke and his wife were being driven around the city in an open-topped car, one of the Serbs – Gavrilo Princip – stepped forward and shot them with a pistol at close range. Both were killed.

This assassination proved to be the spark that ignited the First World War

Following the assassination, Austria-Hungary approached Germany to see if they would support a war against Serbia.

Germany agreed and on 28th July 1914, Austria-Hungary declared war on Serbia.

As Serbia’s major ally, Russia sought to protect them and declared war on Austria-Hungary.

It was this declaration of war which triggered the alliance systems and drew Germany, France, Russia and Great Britain into a devastating conflict.

The war would last for four years and claim the lives of around forty million people.

It also led to the collapse of three empires:

• The Austria-Hungarian Empire.
• The Russian Empire.
• The Ottoman Empire.

There is no one clear reason as to why the war began and no one clear party to blame.

Some place the blame on Serbia due to their involvement in the assassination of Franz Ferdinand.

Others set it at the feet of Germany due to their unconditional support of Austria-Hungary and argue that they could have done more to talk Austria-Hungary down.

The isolation of Germany which then led to two alliance systems emerging in Europe certainly heightened tensions rather than relieving them.

It is likely that the outbreak of WWI was not caused by a single event but rather several events which led to the building of tensions over several decades to the point that it could no longer be contained.