X:

+Shumbath kumar that will be very long and endless discussions, and no matter what I say, you will not believe it, so what is the point? How about we just concentrate on the reality? Tibet is a part of China now, isn't?

How about we use a statement from UK government in 2008 as prove?:
"Like every other EU member state, and the United States, we regard Tibet as part of the People’s Republic of China."

With 40,000 Chinese troops in its country, the Tibetan government was forced to sign the"Seventeen Point Agreement" which recognised China's rule in return for promisesto protect Tibet's political system and Tibetan Buddhism.

We thought China is a friend before 1962 and also have slogans that “Bharat Chini Bhai Bhai"(India China are like brothers) but because of 1962 war we understood that any friend can turn into an enemy.
But from now onwards we should not fight with each other. And become friends once again.

We don't want Tibet. Himalayas is our border but some Chinese are saying that Arunachal Pradesh and Sikkim are a part of south Tibet we don't want to lose our states. And even today Aksai chin was under the control of China but it is a part of Kashmir which is a part of India

+Shumbath kumar again, it shows your wishful thinking,
you think Himalaya should be the border, then it must be the border, you never asked if China agrees? If China does not agree, then you would enforce it by force? this was exactly what PM Nehru did before the war, everyone knows the results, as I said, you guys never learn.
China never accepted Himalaya (mcmahon line) is the border,
the reason is very simple, Tawang is at the other side of Himalaya, go to Wikipedia, it says : "Tawang was historically part of Tibet inhabited by the Monpa people. "
see?
This is China's position, Arunachal Pradesh (most of it) was part of Tibet, since Tibet is part of China, therefore, Arunachal Pradesh (historically the part under Tibet control) belongs to China.
I understand there must be some evidence that Arunachal Pradesh (whole) belongs to India.
Tibet was on top of Himalaya, in old times, it was easier for Tibetan army to rush down the mountain to take control the area, it was not easy for people from low land to attack the army on the top of a mountain, there is no base for using Himalaya as border.
The same is true for Aksai chin, sure you have evidence that it belongs to India, however, China also has evidence it belongs to China, simply send army to occupy it would not work for India as it showed in 1962.