Following is the chronology of some key developments related to the landmark Indo-US nuclear deal:

1968: India refuses to sign the nuclear Non-Proliferation Treaty (NPT), saying it’s discriminatory.
May 18, 1974: India conducts its first nuclear test.

March 10, 1978: US stops nuclear assistance to India.

May 11-13, 1998: India conducts five underground nuclear tests.

July 18, 2005: President George W Bush and Prime Minister Manmohan Singh first announce their intention to enter into a nuclear agreement.

July 26, 2006: The House of Representatives passes the “Henry J Hyde US-India Peaceful Atomic Energy Cooperation Act of 2006”, which stipulates that Washington will cooperate with New Delhi on
nuclear issues and exempt it from signing the NPT.

Nov 16, 2006: The Senate passes a law to exempt some US export of nuclear materials, equipment, and technology to India.

Aug 3, 2007: The text of the 123 agreement for cooperation between the US and India on peaceful uses of nuclear energy released.

Sept 4, 2007: UPA-Left committee to discuss N-deal set up.

July 8, 2008: Left parties withdraw support to the government in protest against the deal.

July 22, 2008: UPA government wins trust vote.

Aug 1, 2008: IAEA board adopts India-specific safeguards agreement unanimously.

Aug 21-22, 2008: NSG meet to consider an India waiver ends inconclusively amid reservations by some countries.

Sep 4-6, 2008: NSG meets again after the US comes up with a revised draft and grants waiver to India after marathon parleys.