I wonder if US-Indian relations would have been better had Vallabhbhai Patel
https://en.wikipedia.org/wiki/Vallabhbhai_Patel enjoyed better health and longer life, and if he instead of Nehru had been Prime Minister during the 1950's (and how you get that I don't know--presumably something has to happen to Nehru...) Patel seems to have been considerably less friendly to Communist China than Nehru was. See his letter to Nehru of November 7, 1950:
"...even though we regard ourselves as the friends of China, the Chinese do not regard us as their friends. With the Communist mentality of "whoever is not with them being against them", this is a significant pointer, of which we have to take due note. During the last several months, outside the Russian camp, we have practically been alone in championing the cause of Chinese entry into UN and in securing from the Americans assurances on the question of Formosa. We have done everything we could to assuage Chinese feelings, to allay its apprehensions and to defend its legitimate claims in our discussions and correspondence with America and Britain and in the UN. Inspite of this, China is not convinced about our disinterestedness; it continues to regard us with suspicion and the whole psychology is one, at least outwardly, of scepticism perhaps mixed with a little hostility. I doubt if we can go any further than we have done already to convince China of our good intentions, friendliness and goodwill. In Peking we have an Ambassador who is eminently suitable for putting across the friendly point of view. Even he seems to have failed to convert the Chinese. Their last telegram to us is an act of gross discourtesy not only in the summary way it disposes of our protest against the entry of Chinese forces into Tibet but also in the wild insinuation that our attitude is determined by foreign influences. It looks as though it is not a friend speaking in that language but a potential enemy.
"In the background of this, we have to consider what new situation now faces us as a result of the disappearance of Tibet, as we knew it, and the expansion of China almost up to our gates... All along the Himalayas in the north and north-east, we have on our side of the frontier a population ethnologically and culturally not different from Tibetans and Mongoloids. The undefined state of the frontier and the existence on our side of a population with its affinities to the Tibetans or Chinese have all the elements of the potential trouble between China and ourselves. Recent and bitter history also tells us that Communism is no shield against imperialism and that the communists are as good or as bad imperialists as any other. Chinese ambitions in this respect not only cover the Himalayan slopes on our side but also include the important part of Assam. They have their ambitions in Burma also. Burma has the added difficulty that it has no McMahon Line round which to build up even the semblance of an agreement. Chinese irredentism and communist imperialism are different from the expansionism or imperialism of the western powers. The former has a cloak of ideology which makes it ten times more dangerous. In the guise of ideological expansion lie concealed racial, national or historical claims. The danger from the north and north-east, therefore, becomes both communist and imperialist. While our western and north-western threat to security is still as prominent as before, a new threat has developed from the north and north-east. Thus, for the first time, after centuries, India's defence has to concentrate itself on two fronts simultaneously. Our defence measures have so far been based on the calculations of superiority over Pakistan. In our calculations we shall now have to reckon with communist China in the north and in the north-east, a communist China which has definite ambitions and aims and which does not, in any way, seem friendly disposed towards us.
"Let us also consider the political conditions on this potentially troublesome frontier. Our northern and north-eastern approaches consist of Nepal, Bhutan, Sikkim, Darjeeling and the tribal areas in Assam. From the point of view of communication, there are weak spots. Continuous defensive lines do not exist. There is almost an unlimited scope for infiltration. Police protection is limited to a very small number of passes. There, too, our outposts do not seem to be fully manned. The contact of these areas with us is by no means close and intimate. The people inhabiting these portions have no established loyalty or devotion to India. Even Darjeeling and Kalimpong areas are not free from pro-Mongoloid prejudices. During the last three years, we have not been able to make any appreciable approaches to the Nagas and other hill tribes in Assam. European missionaries and other visitors had been in touch with them, but their influence was in no way friendly to India or Indians. In Sikkim, there was political ferment some time ago. It is quite possible that discontent is smouldering there. Bhutan is comparatively quiet, but its affinity with Tibetans would be a handicap. Nepal has a weak oligarchic regime based almost entirely on force: it is in conflict with a turbulent element of the population as well as with enlightened ideas of the modern age. In these circumstances, to make people alive to the new danger or to make them defensively strong is a very difficult task indeed and that difficulty can be got over only by enlightened firmness, strength and a clear line of policy. I am sure the Chinese and their source of inspiration, Soviet Union, would not miss any opportunity of exploiting these weak spots, partly in support of their ideology and partly in support of their ambitions. In my judgement the situation is one which we cannot afford either to be complacent or to be vacillating..."
http://www.friendsoftibet.org/main/sardar.html