Why would a historian use a primary source when studying a historical event?

Interest groups are protected by the first amendment guarantees of petition and what other freedom?

Following archduke franz ferdinand's assassination, austro-hungarian leaders: a. aided the ottoman empire in its campaign to keep serbia under its control. b. executed nearly all prominent serbs living in austria-hungary c. threatened to invade serbia if serb leaders did not agree to a set of strict demands. d.. formed an alliance with great britain to protect austria-hungary from future attacks.

Was “labor violence” inevitable and unavoidable ?