Hapsburgs decide to expand Austrian territory to include regions such as Croatia and Slavonia to gain more power and influence over them.
Habsburg Empire is made of many territories which are United or bounded by a common rule by the Habsburg.
Austria is one of the empire of Habsburg and they centralized their own power in there place to become more powerful and influential.
Therefore, Hapsburgs decide to expand Austrian territory to include regions such as Croatia and Slavonia to gain more power and influence over them.
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