Austria-hungary attacked Serbia
Germany, Austria/Hungary, and Italy by the Triple Alliance!!
The assassination of Franz Ferdinand sped up developments because Austria then threatened to invade Serbia as punishment, and then Russia thought it should defend Serbia.
Austria-Hungary's demands from Serbia basically questioned Serbia's sovereignty and called upon the dissolution of the country. That is why Serbia did not accept the ultimatium and that is why Austria-Hungary declared war, starting World War I.
ANSWER The main reasons were followings: 1 - because they were found humiliating and damaging the independence of Serbia; 2 - because Serbia was backed by Russia (which had pledged its intervention in case of Austria had attacked Serbia), in rejecting the demands.
Austria issued Serbia a 10-part ultimatum in response to the role of Serbian and Slavic nationalists in the assassination of the Austrian archduke.
Russia, Serbia
+381 is code for Serbia, then you need to know what city you are calling and add its number. For example: code for Belgrade-capital of Serbia is 011, but you drop the leading 0 for international calls. Dial 00 = international access prefix from India 381 = country code for Serbia Serbian area code, without leading zero local number
Austro-Hungarian Archduke Franz Ferdinand was assinated by Serbian nationalists. Austria declared war on Serbia. Russia, allied with Serbia, declared war on Austria, Germany declared war on Russia, England and France declared war on Both.
The Austro-Hungarian Empire.In June 1914, the heir to the Austrian throne was murdered in Sarajevo, by Bosnian nationalists- Bosnia was ruled by the Austro-Hungarian Empire at the time, and Sarajevo is Bosnia's capital city. These nationalists were believed by the Austrian government to have been supported by intelligence agents from nearby Serbia, a country Austria already didn't like (and vice versa). Serbians and Bosnians are related ethnic groups, so Serbia (supposedly) wanted to help their Bosnian cousins break away from Austria.After the assassination, Austria issued a list of demands to the Serbian government, saying that if Serbia did not accept allof them, then Austria would attack. Serbia accepted all but one (from what I understand, the Serbian constitution at the time forbade them from accepting it), and Austria declared war on Serbia, which began World War I.
They saw Austrians as oppressive foreign rulers.
Serbian nationalism is arguably the entire cause of World War 1. On a very important anniversary for the Serbians, Arch-Duke Ferdinand, the symbol of Serbia's oppression to the nationalists, held a parade in their country. Nationalists then assassinated him on that day, though only after a few mishaps. This became the declaration of war for the Great War.
Serbia
no world war 1 was the result of serbian nationalists killing the austrain king. austria and Germany declared war on Serbia and France and Britain were in alliance with Serbia so were dragged in. world war II started because nazi Germany invaded cezhoslovakia so Britain responded by declaring war.
Serbia is country code +381. The plus sign means "insert your international access prefix here"; from the US, that's 011. Also, you need to drop the leading '0' from the Serbian number.
Serbia doesn't have high average salaries (10 000$ per year) but it is one of the leading states in the Balkan peninsula, and it is expected to triple her GDP by the year 2019. Serbia's major national interest is to become member of the European Union within the next six years.
Austria Hungary is a country composed of many different ethnic groups ruled by the duke. Serbia was the country that backed up any nationalist movements by the ethnic groups to break free of Austria. After the Black Hand(a nationalist group) assassinated the Arch Duke and princess of Austria, Austria blamed their neighbor country Serbia because of their support for nationalists inside Austria. When this happened Russia, basically Serbia's big brother figure (in fact, they are closely related because they share allot of the same ethnicity) came to Serbia's aid. Germany, an ally of Serbia, that had been militarizing upto this point backed up Austria in order to "defend its Ally".