The Serbian assassination of the Austrian Archduke Ferdinand.
World War I had its beginnings in a serious "disagreement" between rival groups within the Austro-Hungarian Empire, the dominant group and a handful of independence-minded groups which resented imperial control. When the tensions between these groups erupted into violence with the assassination of Archduke Ferdinand (a leader among the dominant group), World War I soon erupted, as well, with various nations coming to the aid of one or the other of the groups involved in the rivalry until nearly the entire world was at war.
World War I wasn't the most destructive war. World War II was. World War II had over eight times as many casualties as World War I and also brought total war to a whole new level. It completely put Europe in ruins, but World War II was definitely the war to end all wars. After that came the Cold War, which was just political disagreement with words thrown around.
There were many occurrences that may have helped to formulate WW1. Most people believe that the main cause started with the assassination of Archduke Franz Ferdinand on June 28th 1914.
It wasn't a disagreement, it was when Hitler became leader of the Nazi Party and invaded Poland and other European Countries. Then Japan bombed Pearl Harbor, Hawaii which got the U.s. involved.
The Serbian assassination of the Austrian Archduke Ferdinand.
hitler
The assassination of Archduke Franz Ferdinand.
Nothing ´cause there is only 2 wars in all the World.
Cold War
World War I had its beginnings in a serious "disagreement" between rival groups within the Austro-Hungarian Empire, the dominant group and a handful of independence-minded groups which resented imperial control. When the tensions between these groups erupted into violence with the assassination of Archduke Ferdinand (a leader among the dominant group), World War I soon erupted, as well, with various nations coming to the aid of one or the other of the groups involved in the rivalry until nearly the entire world was at war.
The immediate origins of World War 1 lay in the decisions taken by statesmen and generals during the July Crisis of 1914 caused by the assassination of Archduke Franz Ferdinand and his wife Sophie by Gavrilo Princip.
millions died in world war 1 millions died in world war 1 millions died in world war 1 millions died in world war 1 millions died in world war 1 millions died in world war 1 millions died in world war 1 millions died in world war 1 millions died in world war 1 millions died in world war 1 millions died in world war 1 millions died in world war 1 millions died in world war 1 millions died in world war 1
There are many different specific issues which have resulted in war. But to give a general answer that applies to all war, people go to war in order to settle a disagreement by force.
The immediate origins of the war ay in the decisions taken by statesmen and generals during the July Crisis of 1914 caused by the assassination of Archduke Franz Ferdinand and his wife Sophie by Gavrilo Princip.
Slavery
they fought