Thread on Evolution of Sino-India Border

I expect followers not to tag official govt handles and create unnecessary hype.

This thread includes generic information of the border post 1987 as the longitude-latitude wise information is only available with Army and not in public domain. Post 1987 information is taken from satellite imageries, generic archive records available in public domain.

The modern nation states are based on shared idea of their definition, some might be synthetic but they all are based on a common definition. Territorially, China considers itself as a nation state having same borders as that of Qing Dynasty

while India considers itself as a civilizational state between Himalyas and Indian Ocean whose boundary is based on long customs and latest treaties inherited by Dogras,Hill states,Sikkim,Bhutan Kingdom and British India on one side and the Tibetian Empire.

which was nominally independent under Qing and the Qing had authorized them to have treaties which they refused by 1920s.
Lets first go back to 2 main great Chinese extents-
Ming Dynasty with independent Tibet 1368-1644