The UN Resolution required Pakistan to vacate Kashmir, something they did not do. As a result of this plebiscite was not held in 1948.
Incorrect - please see this thread:
http://www.defence.pk/forums/kashmir-war/7904-kashmir-resolutions-explanations.html
The Pakistani withdrawal was contingent upon successful negotiations between Pakistan, India and the UN rapporteur, negotiations that India and Nehru essentially sank.
Then, In the 1960s, after Pakistan gifted part of Kashmiri territory to China, and the first democratic elections were held in Indian Kashmir (according to Indian constitution, if elections are held in a state, the state is a part of that country).
No territory was 'gifted' - the transfer of the administration of the Trans Karakoram tract, at the time uninhabited and barren, does not change the fact that it remains disputed territory.
Pakistan's agreement with China in fact clearly indicates that India and China will have to enter into negotiations over the territory and demarcation of the boundary along the territory, if kashmir is settled in India's favor.
What the Indian constitution says is irrelevant in the context of an international dispute - you cannot for example say that if X number of Indians settle in California, it is an Indian State. The 'Indian constitution says so' argument holds no weight internationally.
Moreover Pakistan had begun to change the demographics of Azad Kashmir by settling in lare numbers of Punjabis (just as they have been doing in Balochistan). It was after this that India said that plebiscite is no longer feasible and no longer necessary.
Stats from a neutral source indicating the impact on demographics please.
Had Pakistan vacated Kashmir when the UN told it to, and had it not gifted part of Kashmir to China, things would have been different.
Please see responses above.
I'd also like to remind my fellow Pakistanis that it wasn't only Maharaja of Kashmir who acceded to India. Sheikh Abdullah, who was the most popular politician of Kashmir (even majority of Kashmiri Muslims supported him him) had publicly favoured accession to India. He had suggested the Maharaja to choose India.
Does not matter what an individual favored, it is the plebiscite in which the opinion of all the people of Kashmir was to be weighed, as validated by the UNSC resolutions, that counts.
And I'd also like to remind Pakistanis that when Pakistani army/tribesmen invaded Kashmir, it was the local Kashmiris who initially fought back.
Untrue - it was the Maharajah's troops that fought back - in fact, before the tribes invaded, there was a local Kashmiri uprising, centered around the Poonch district against the dictator Maharajah, that resulted in the Maharajah sending in troops to crush it with rather brutal tactics that caused the exodus of thousands of Kashmiris into Pakistan, acting as a catalysts for the Tribal invasion.
If only Pakistan had let the political movement in Kashmir take its own natural course...
If only India had not reneged on its commitment and the rules of partition and allowed the Kashmiris to exercise self-determination to choose which nation they wished to be part of.