The renaming of the cities in India started in 1947 following the end of the British imperial period. Several changes were controversial, and not all proposed changes were implemented. Each had to be approved by the Central Government in New Delhi. The renaming of states and territories in India has also taken place, but until the 2010s with actual substantial name changes in both local language and in English such as the old British state name of Travancore-Cochin to Kerala (1956). The most notable exceptions are Indian English spelling-changes of Orissa to Odisha (March 2011) and the union territory of Pondicherry (which includes the city of Pondicherry) to Puducherry. Causes for renaming Need for standardisation of spelling India has various local languages. Even (Romanised) English spellings in long and wide use often vary depending upon which government department or agency uses them. To the point, a few examples are Quilandy vs. Koyilandy, Canannore vs. Kannur, and Rangiya vs. Rangia. Different departments of the government may have used official spellings in use at the time, while locations associated with Indian railways mostly maintained British-era spellings. The confusion inherent in such variations has often resulted in serious consequences like people having two "different" addresses (theoretically designating the same place) in their official records leading to legal disputes, or one house having residents of different house addresses due to differing place names. Many people argue that such confusion can lead to indeterminate and/or unintended consequences. Renaming in local languages In the post-colonial era, several Indian states' names were changed. Some of these changes coincided with the States Reorganisation Act of 1956, a major reform of the boundaries of India's states and territories that organised them along linguistic lines. At this time, for example, Travancore-Cochin was renamed Kerala. Later state name changes include the reorganisation of Madhya Bharat into Madhya Pradesh in 1959; and the renamings of the Madras State to Tamil Nadu in 1969, of the Mysore State to Karnataka in 1973, and of Uttaranchal to Uttarakhand in 2007. Name changes have varied with respect to the levels of language at which they have been applied, and also accepted. Some of these local name changes were changes made in all languages: the immediate local name, and also all India's other languages. An example of this is the renaming of predominantly Hindi-speaking Uttaranchal () to a new local Hindi name ( ). Other changes