Exactly at what moment did India become a vassal state of the United States of America? Or was it a slow crawl in the last 15-20 years?

Here is the American manifesto for the Indian elections, as published by the US India Business Council : 


USIBC 2014-2015 Way Forward

Read https://drive.google.com/file/d/0BxHBZ8fQxNoQNDhJUlZESVJBelk/edit?usp=sharing