Austria-hungary wanted to expand its empire into the country of serbia. gavrilo princip, a member of a serbian terrorist organization, assassinated archduke __________ _______________ of austria-hungary (heir to the throne). this set off a series of events which caused austria-hungary and germany to declare war on serbia. this also brought in serbia’s friend ________________ and the other members of the triple entente. ______________ did not join its fellow triple alliance members but instead switched sides and joined the triple entente and serbia to form a new alliance called the allied powers (aka the allies). germany, austria-hungary, ______________ and the ottoman empire (turkey) formed a new alliance called the central powers.