Why was Archuke Francis Ferdinand assassinated ?

Check the first paragraph in this site.

http://en.wikipedia.org/wiki/Assassination_in_Sarajevo

how did Austria-Hungary react to Archduke Francis Ferdinand assassinated?

Did you read that article that Ms. Sue posted? Scroll down until you find the section called Aftermath.

How did Austria-Hungary react to Ferdinand assassinated? they declard war on Serbia.

would this be the answer

Right.

Archduke Franz Ferdinand was assassinated on June 28, 1914, in Sarajevo, Bosnia and Herzegovina. The assassination was a major catalyst for the start of World War I. To understand the reasons behind his assassination, we need to examine the historical context.

1. Historical Background:
At the time, Bosnia and Herzegovina were under Austro-Hungarian control. The region had tensions among different ethnic and nationalist groups, including Serbs, Croats, and Bosniaks.

2. Serbian Nationalism:
A group called the Black Hand, consisting of Serbian nationalist members, sought to unite all Serb-populated regions into a single country, often referred to as Greater Serbia. They despised the Austro-Hungarian Empire, which controlled Bosnia with a significant Serbian population.

3. Austro-Hungarian Rule:
Many Serbs viewed the Austro-Hungarian Empire as oppressive due to its control over Bosnia and Herzegovina. They saw the assassination of Franz Ferdinand as a way to weaken Austro-Hungarian control and potentially trigger the nationalist sentiments of other territories.

4. Immediate Trigger:
Gavrilo Princip, a Bosnian Serb and member of the Black Hand, assassinated Franz Ferdinand and his wife, Sophie. Princip was motivated by the desire for Bosnian independence from Austro-Hungarian rule.

5. Political Reaction:
The Austro-Hungarian Empire considered the assassination an act of terrorism and sought retribution. They issued an ultimatum to Serbia, demanding various concessions and investigations into the Black Hand group. When these demands were not fully met, Austro-Hungary declared war on Serbia.

6. Chain Reaction:
The assassination of Archduke Franz Ferdinand led to a series of diplomatic and military actions among European powers, eventually leading to the outbreak of World War I.

So, to summarize, Archduke Franz Ferdinand was assassinated due to the prevailing tensions, ethnic rivalries, and Serbian nationalism in the region, as well as the desire for Bosnian independence from Austro-Hungarian rule. The consequences of his assassination ultimately triggered the start of World War I.