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They declared war on Serbia.
WW1 started in 1914, a result of the assassination of Archduke Ferdinand of Austria. That year, several European countries declared war on each other. In 1917, the US entered, declaring war on Germany.WW2 is generally agreed to have started on September 1, 1939 with the German invasion of Poland. The US entered the war after the Japanese bombing of Pearl Harbor in December of 1941.
The causes of the Great War (or, World War I) were several in number. Principally, the assassination of a highly placed leader in the Austro-Hungarian Empire, the Archduke Franz Ferdinand, led to hostilities in the Balkans. As a result, the infamous 'alliance-system' of Europe led to the addition of other belligerents. Throughout, the rampant nationalist that dominated Europe at the time led to eager involvements from still other nations.
lmmediate cause is the final act in a particular result or event
The final act in a series of provocations leading to a particular result or events
They declared war on Serbia.
World War I broke out in 1914 as a result of the assassination of Archduke Franz Ferdinand.
The assassination of Franz Ferdinand, the Archduke of Austria in 1914 was the murder, Serbia and Austria declared war, and the Great War or WWI was the result.
Archduke Ferdinand and his wife were assassinated by a Serbian Nationalist acting on his own. As a result, Austria-Hungary declared war on Serbia. Germany, with a military alliance with Austria-Hungary, backed them up militarily. This action forced Britain and France to declare war on Germany. The rest is history.
World war 1
That attack was most likely the result of an order directly from Ferdinand Marcos.
The Great War (later known as World War 1).
World War 1 was, for one reason, started by the assassination of Archduke Ferdinand.
It was the assassination of the Habsburg heir, the Archduke Franz Ferdinand, by Bosnian Serbs, as a protest against Austrian rule. The success of this plot was quite accidental. A disorganised amateur group of teenagers had planned the assassination, but they had managed only to throw one bomb that missed its target. As a result, the Archduke ordered a change of route, but the chauffeur didn't hear him. In the confusion, the car halted on a corner, where one of the conspirators, who was armed with a pistol, saw the stationery vehicle and fired his weapon, killing Franz Ferdinand and his wife. The Austrians took this as a mortal insult, and Germany urged them to take a tough line against Serbia. Russia felt it ought to mobilise in support of its Slav brethren, and the whole bluffing game went on for a few disastrous weeks until Britain finally declared war on Germany.
Before World War I, the various alliances in the Balkan region led to it being called the Powder Keg of Europe. Rampant nationalism created a volatile, dangerous situation which culminated in the assassination of Archduke Franz Ferdinand, resulting in the first World War.
An immediate result of the Renaissance was the Reformation.
Gavrilo Princip, a 19 year old member of the Serbian Blackhand, shot the Archduke Ferdinand and his wife Sofia in Sarajevo. Ferdinand was the sole heir to the Austo-Hungarian throne. As a result, Austria-Hungary declared war on Serbia.