What were the cause and consequences of Assassination in WW1?

One cause of WWI is the assassination of Archduke, Franz Ferdinand of Austria-Hungary and his wife on June 28, 1914 by a Serbian nationalist from the Black Hand organization. Immediately this event is the trigger that set off declarations of the war.Explanation:

powers  are  denied  to the  national governmentin three distinct ways: some  powers, such as the  power  to levy duties on exports or prohibit the freedom of religion, speech, press, or assembly, are expressly  denied  to the  national government  in the  constitution.