Borders have a habit of becoming sacrosanct. Schoolchildren are made familiar with the shape of their country, with geography usually supported by history, language, religion, and (more broadly) culture. This is so even in India, which has existed as a cultural entity, but not as a nation-state, from pre-historic times. Adi Shankaracharya travelled to all corners of the “country” to establish places of devotional learning in the ninth century. At the time, the Pallavas ruled in much of south India and the Gurjara-Pratiharas (including the Chandelas) in the north, but of course there were no passports or visas.
Even with the nation-state, most people are not conversant with how and when it took shape. What they are more cognizant of is its late 19th-century personification as Bharatmata. Vedic India, for instance, was essentially in the north-western part of the country. The post-Vedic empires stretched from further east, in Bihar. And north-eastern India today is the product of wars fought by the British. Assam came within the national boundary in 1826 after it was acquired by the East India Company from the king of Burma following a bloody war in 1824. Darjeeling was leased from the Sikkim Chogyal in 1835 for setting up a sanatorium. Much of Sikkim itself had been taken over by the Gorkhas of Nepal, and handed back to the Chogyal after the British took it from the Nepalese. Kalimpong and the Dooars became part of Darjeeling district only after a battle with Bhutan, in 1865. Yet, today, they are all inalienable parts of India, as is Sikkim itself after 1975.
In the east, the crucial Tawang tract in Arunachal Pradesh fell south of the McMahon Line (to which India holds) only because of a convenient deviation from the watershed principle. In fact, India did not take proper administrative control of Tawang till 1951, four years after Independence, and it did so because Chinese forces had marched into Tibet in 1950.
In Europe, Italy and Germany did not exist as geographical entities till the second half of the 19th century. Europe’s frontiers changed equally dramatically after each of the World Wars, and then again with the collapse of the Soviet Union. And the United States would never have stretched “from sea to shining sea” if Napoleon had not sold the territories east of the Mississippi to Thomas Jefferson in 1803, doubling the geographical size of the US in one stroke.