<p>I would think it probably has something to do with the fact that India was a British Colony. During the era of colonization, there were probably many Indians who went to the UK to study and live which was made easier because of the status of India as a colony. As time went on, more and more Indians probably left for the UK with hopes of getting a better life and education and whatnot which was made easier by the fact that they knew people in India (think going to place where you know more people than going to a place where you’d be pretty much isolated for a while).</p>
<p>I, however, cannot say for sure since i am not from india but I am talkking from the perspective of a Nigerian which was in pretty much the same position as India in terms of colonization. The fact of the matter, however, remains that there is also a sizeable amount of people in the U.S like mysticgohan said</p>