the group that conspired to assassinate Archduck francis ferdinand was

First -- it's not Arch duck. He was the Archduke. <g>

Either the Serbs or the Slavs.

http://www.eyewitnesstohistory.com/duke.htm

The Black Hand

The group that conspired to assassinate Archduke Franz Ferdinand was known as the Black Hand (also called "Unification or Death"). The Black Hand was a secret society founded in Serbia in 1911 with the aim of unifying all territories populated by South Slavs, which included Bosnia-Herzegovina.

To find the answer to this question, you can conduct a simple search on a reliable search engine or refer to historical books and sources. Using keywords such as "assassination of Archduke Franz Ferdinand" or "Black Hand" will yield relevant information. Additionally, you can explore articles or documentaries about the events leading up to World War I, as the assassination of the Archduke played a significant role in triggering the conflict.