Nationalism was also a source of anger between France and Germany as France resented its defeat in the (1870-1871).
Alliances between European nations can also be considered an of World War I.
Alliances pulled countries into war because if they were not followed a threat of retaliation would be expected.
On the other hand.
Other causes include Nationalists wanting freedom, causing the Slavs to ultimately assassinate the duke and causing hate towards to Austrian empire.
In the years before World War 2 Stalin murdered or imprisoned almost all of Russia's senior military officers, and millions of other Russian citizens, in a paranoid and unprecedented wave of political terror.
In addition to the great weakness caused by the absence of experienced senior officers because of Stalin's political murders, Stalin further damaged the Russian military's ability to fight by first obsessively ignoring all the intelligence warnings of the incoming German invasion, and later by obsessively enforcing a rigid and very wasteful defensive strategy which helped the German military to achieve tremendous victories in the summer of 1941 and brought the Germans all the way to Moscow.
Historian Fischer Geiss said “Germany only wanted a war, prepared for it, and ultimately provoked it in 1914 in order to advance Germany’s position into the world” The Kaiser claimed “only those powers who had great navies will be listened to with respect.” These races produced massive amounts of ammunition which was to be wasted with the lives on the battle fields.
The assassination did not occur because of an alliance or treaty, nor did the war with Serbia occur because of an alliance which plunged all of Europe into a war.
The various European countries invaded and colonised the African countries to gain power over their neighbouring countries This caused lots of tension between the countries and is one of the causes of world war 1.
The high tensions between European nations ultimately led to the declaration of war on Serbia by Austria on July 28, 1914, marking the beginning of World War I.
France mobilized on the side of Russia, Germany decided to declare war on France which put the Schlieffen plan in action causing Britain to declare war on Germany because of the invasion of Belgium.
They all believed their own propaganda about their military preparedness and about their own superiority.” 2 “ They had all been deceived in to believing that they were embarking on a war of movement and attack, in which a few, sharp blows would lead to a rapid and adventurous position.” Military personnel knew very little about their opponents capability of destroying and attacking which placed a lot of unnecessary bloodshed on the fields.
Each country guaranteed a winning plan but they were not based on reality, everybody was ultimately fooled by their own propaganda which led to the scale of this war.
The alliance system did cause the size of the war as it brought and pulled countries in to the war.
Such were the mechanics that brought the world's major nations into the war at one time or another. It's clear from the summary above that the alliance system was as much at fault as anything in bringing about the scale of the conflict.
In march 1940, already in World War 2, and with the French military passively deployed along the Maginot line of border fortifications, Daladier was replaced by Paul Reynaud, but remained in government as war minister.
Some immediate causes were the assassination of the heir of Austria-Hungry, Germany declaring war on Russia, Germany declaring war on France, and Great Britain declaring war on Germany.
Austria-Hungary signed an alliance with Romania in 1883, negotiated by Germany, although in the event Romania - after starting World War One as a neutral - eventually ; as such Austria-Hungary's treaty with Romania was of no actual significance.