Manoj Joshi on the back story to the India-China standoff: In The Hindu:
In 1950, the Survey of India issued a map of India showing the political divisions of the new republic. While the border with Pakistan was defined as it is now, including the Pakistan-occupied Kashmir area, the borders with China were depicted differently. In the east, the McMahon Line was shown as the border, except in its eastern extremity, the Tirap subdivision, where the border was shown as “undefined.” In the Central sector of what is now Uttarakhand and Himachal Pradesh and the eastern part of Jammu & Kashmir, including Aksai Chin, the boundary was depicted merely by a colour wash and denoted as “boundary undefined.”
In March 1954, the Union Cabinet met and decided to unilaterally define the border of India with China. The colour wash was replaced by a hard line, and the Survey of India issued a new map, which depicts the borders as we know them today. All the old maps were withdrawn and the depiction of Indian boundaries in the old way became illegal. Indeed, if you seek out the White Paper on Indian States of 1948 and 1950 in the Parliament library, you will find that the maps have been removed because they too showed the border as being “undefined” in the Central and Western sectors.
What was the government up to? Did it seriously think it could get away with such a sleight of hand? Or was there a design that will become apparent when the papers of the period are declassified? Not surprisingly, the other party, the People’s Republic of China, was not amused and, in any case, there are enough copies of the old documents and maps across the world today to bring out the uncomfortable truth that the boundaries of India in these regions were unilaterally defined by the Government of India, rather than through negotiation and discussions with China. More: