The black hand
The Black Hand was a secret Serbian ultranationalist group that wanted freedom for Bosnia from Austria-Hungary. On a trip to Serbia, Franz Ferdinand, the heir of the Austria-Hungary throne, and his wife were shot dead by Gavrilo Princip, a 19 year old member of The Black Hand.
No. They only wanted to promote 'freeing' the Serb population groups living in Austria-Hungary - such as the one living in and around Serajevo - and uniting them in a 'greater' Serbia. Originally the Black Hand had targeted the Governor of the region but when the terrorists found that Franz Ferdinand would come to visit Sarajevo, they selected him as a much more spectacular target. The Black Hand by the way was a 'secret organization' of which there were several in eastern Europe and Russia. Although the Serbian government was sympathetic to them, the Black Hand did not command any troops with which it could have invaded Austria, even if it had wanted.
Sarajevo, Bosnia, Austria-hungary
The black hand gang
Neither, Franz Ferdinand of Austria-Hungary was assassinated by a Serbian nationalist from the Black Hand. Austria-Hungary declared war on Serbia, then alliances went from there.
Princip didn't like him, and the Black hand gang wanted Serbia to rise up and throw off Austria-Hungary rule.
The Serbian group that assassinated the Archduke of Austria-Hungary was called the Black Hand.
They blame it on Serbia. It was their terrorist organization called the Black Hand that killed him (and his wife).
Serbia, the origin of the Black Hand, had just gained freedom from Austria-Hungary, ruled by Franz Ferdinand. Bosnia had gained control of Bosnia, which had once been part of Serbia, and the Black Hand wanted Bosnia back.
It was a consquence of the Black Hand gang murdering Arch Franz Ferdinand when he visited Sarajevo in Bosnia - the Austrians blamed in on the Serbs as Bosnia wanted to be inderpendant of Austria-Hungary and part of Serbia and declared war.
Serbia's organization, the black hand, was behind the assassination of Archduke Franz Ferdinand of Austria-Hungary, the heir to the throne. There were also many long-term causes leading up to this, but this was the event that set everything in motion