The Compromise (Ausgleich) of 1867 divides the…

The Compromise (Ausgleich) of 1867 divides the Habsburg Empire into two separate states with equal rights under a common ruler, hence the term "Dual Monarchy."

Officially, these states are Hungary and the "Kingdoms and Lands represented in the Parliament," the latter being an awkward designation necessitated by the lack of a historical name encompassing all non-Hungarian lands.

Unofficially, the western half is called either Austria or Cis-Leithania, after the Leitha River, which separates the two states.

The officially accepted name of the Dual Monarchy is Austria-Hungary, also seen as the Austro-Hungarian Empire.