President Barack Obama has backed India's ambition for permanent membership of the UN Security Council.
In an address to India's parliament at the end of a three-day visit, Mr Obama lavishly praised India's development.
His remarks will delight India, which has been lobbying for a seat at the UN's top table for years.
Analysts say it does not mean India will get a seat on the Security Council immediately; the unspecified reforms Mr Obama mentioned could take years.
Mr Obama also said the Washington-Delhi relationship would be one of this century's defining partnerships.
He was applauded as he told dignitaries: "As two global leaders, the United States and India can partner for global security - especially as India serves on the Security Council over the next two years.
"Indeed the just and sustainable international order that America seeks includes a United Nations that is efficient, effective, credible and legitimate.
"And that is why I can say today, in the years ahead, I look forward to a reformed United Nations Security Council that includes India as a permanent member."
The US president is next due to visit Indonesia, South Korea and Japan on a 10-day Asian tour designed to boost US exports.