"Although the erstwhile hill kingdoms of Garhwal and Kumaon were traditional rivals with diverse lingual and cultural influences due to the proximity of different neighbouring ethnic groups, the inseparable and complementary nature of their geography, economy, culture, language, and traditions created strong bonds between the two regions. These bonds formed the basis of the new political identity of Uttarakhand, which gained significant momentum in 1994, when demand for separate statehood (within the Union of India) achieved almost unanimous acceptance among the local populace as well as political parties at the national level."
(Wikipedia: Uttarakhand)