"Although the end of the cold war freed India-U.S. relations from the constraints of global bipolarity, New Delhi-Washington relations continued for a decade to be affected by the burden of history, most notably the longstanding India-Pakistan rivalry. Recent years, however, have witnessed a sea change in bilateral relations,with more positive interactions becoming the norm. India's swift offer of full support for U.S.-led anti-terrorism operations after the September 2001 attacks on the United States is widely viewed as reflective of such change. Continuing U.S. concern in South Asia focuses especially on the historic and ongoing tensions between nuclear-armed India and Pakistan, tensions rooted in unfinished business from the 1947 Partition, and competing claims to the former princely state of Kashmir. The United States also seeks to prevent the regional proliferation of nuclear weapons and ballistic missiles. Both India and Pakistan have so far resisted U.S. and international pressure to sign the major international nonproliferation treaties."
CRS Issue Brief for Congress, IB93097
United States. Dept. of State. Bureau of Public Affairs. Foreign Press Centers: http://fpc.state.gov/