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| 1942 | Fermi, Enrico |  |
| 2nd Dec Chicago A constructed graphite pile is designed to produce weapons-grade plutonium |
| 2nd Dec Chicago Completes the construction of a nuclear reactor at the University of Chicago |
| 2nd Dec Leads a team which creates the 1st controlled nuclear reaction |
| 1945 | Farrell, Thomas F | |
| 16th July Witnesses the test nuclear explosion & says, "the war is over" |
| 1952 | Truman, Harry S | |
| 22nd April The biggest atomic bomb yet is exploded watched on television by 35 million |
| 1953 | Truman, Harry S | |
| 7th Jan Truman announces that the USA had developed the hydrogen bomb |
| 1954 | Eisenhower, Dwight David | |
| 1st Mar The USA carries out the 1st hydrogen bomb test in Bikini Atoll |
| 24th Mar According to Eisenhower the Hydrogen Bomb test exceeds all expectations |
| 1955 | Eisenhower, Dwight David | |
| 10th Mar Eisenhower indicates willingness to resort to nuclear weapons in the event of war |
| 1960 | Fermi, Enrico | |
| Awarded in recognition for supporting the peaceful use of atomic energy |
| 1961 | Kennedy, John Fitzgerald | |
| Announces doubled Minuteman production |
| B-52 & B-47 nuclear bombers placed on crisis footing & half are on a 15 minute alert |
| 1962 | Bundy, McGeorge | |
14th Oct A U-2 spy photographs the secret site where Russian  missiles will be located in Cuba  |
| 1962 | Kennedy, John Fitzgerald | |
| 17th July The USA performs nuclear tests at the Nevada test site |
| 1963 | Kennedy, John Fitzgerald | |
Washington Agrees to sell Polaris to Britain  |
Washington France  refuses to join the Anglo  -American nuclear pact |
| 1970 | Nixon, Richard Mulhouse | |
| 2nd Nov Helsinki 3rd round of SALT talks open in Helsinki |
| 1971 | Nixon, Richard Mulhouse | |
| 15th Mar Vienna 4th round of SALT talks begin in Vienna |
| 1972 | Nixon, Richard Mulhouse | |
| 4th Feb The 6th round of the SALT talks begins in Vienna |
| 29th May SALT I treaty signed |
| 8th July The 5th round of the SALT talks begins in Helsinki |
| 1979 | Carter, Jimmy | |
| Symington Ceases economic assistance to nonnuclear weapon countries that import uranium-enrichment technology |
| Vienna Senate fails to ratify SALT II |
| Vienna The primary goal of SALT II is to replace the Interim Agreement with a long-term comprehensive treaty providing broad limits on strategic offensive weapons systems |
Vienna The USA does not ratify the treaty after Russia Afghanistan  s in Dec 1979, Carter & Reagan agree to comply with the provisions if Russia reciprocates |
| 18th June Vienna Negotiated for 7 years & finally signed by the USA & Russia, but never ratified |
| 18th June Vienna The completed SALT II agreement is signed by President Carter & General Secretary Brezhnev |
| 1980 | Carter, Jimmy | |
| 3rd Jan Carter announces the USA will comply with the provisions of the treaty as long as Russia reciprocates, Brezhnev make a similar statement |
| 3rd Jan Carter requests the Senate majority leader to delay consideration of the treaty on the Senate floor in view of the Soviet invasion of Afghanistan |
| 1982 | Reagan, Ronald Wilson | |
| May President Reagan states he will do nothing to undercut the SALT agreements as long as the Soviet Union shows equal restraint |
| 1983 | Reagan, Ronald Wilson | |
| 23rd Mar Outlines his Strategic Defense Initiative to defend the USA & allies |
| 1984 | Reagan, Ronald Wilson | |
| Reagan declares that the Soviet Union had violated its political commitment to observe the SALT II Treaty |
| 1985 | Reagan, Ronald Wilson | |
| 8th Jan Agrees to negotiate for nuclear disarmament with Moscow |
| 1988 | Reagan, Ronald Wilson | |
| May Moscow INF treaty ratification documents are exchanged between Russia & the USA |
| May Moscow The 4th meeting between Reagan & Gorbachev |
| 1991 | Bush, George Herbert Walker | |
28th July President Bush warns Iraq  it would be making "an enormous mistake" if it failed to disclose its nuclear weapons program to United Nations inspectors |
| 31st July Bush & Gorbachev sign the Strategic Arms Reduction |
| 27th Sep Announces cuts in nuclear weapons |
| 1992 | Bush, George Walker | |
| 29th Jan President Bush and President Yeltsin cap the first day of their Washington summit by announcing their countries had agreed to slash their long-range nuclear arsenals by two-thirds |
| 17th June President Bush and President Yeltsin sign a breakthrough arms-reduction agreement, addressing Congress , Yeltsin pledges to find any American prisoners of war still being held in Russia |
| 1999 | Clinton, William Jefferson Bill | |
| 6th Jan Washington officials say agents on arms inspection teams discovered secret weapons programs |
12th Jan The USA imposes sanctions on three institutions accused of helping Iran  and possibly other nations to develop nuclear weapons and missiles |
| 2001 | Bush, George Walker | |
| Sep A report by Central Intelligence Agency accuses Iran of having one of the world's most active programmes to acquire nuclear weapons |
| 2002 | Bush, George Walker | |
| Sep Russian technicians begin construction of Iran 's first nuclear reactor at Bushehr despite strong objections from US |
| Dec The USA accuses Iran of seeking to develop a secret nuclear weapons programme and publishes satellite images of two nuclear sites under construction at Natanz and Arak |
| 17th Dec Orders the construction by 2004 of a limited missile defense shield |
| 2003 | Bush, George Walker | |
| June White House refuses to rule out the "military option" in dealing with Iran after IAEA says Iran "failed to report certain nuclear materials and activities" |
| 2004 | Bush, George Walker | |
5th Jan Officials declare Pakistan  i scientists gave Libya technology to build nuclear weapons |
| 2005 | Rice, Condoleezza | |
| June USA Secretary of State Condoleezza Rice says IAEA head Mohamed ElBaradei should either toughen his stance on Iran or fail to be chosen for a third term as IAEA head |
| 2006 | Bush, George Walker | |
| Mar USA National Security Strategy decries Iran , stating that "Iran has violated its Non-Proliferation Treaty safeguards obligations and refuses to provide objective guarantees that its nuclear program is solely for peaceful purposes |
| 2006 | Rice, Condoleezza | |
| Mar USA National Security Strategy decries Iran , stating that "Iran has violated its Non-Proliferation Treaty safeguards obligations and refuses to provide objective guarantees that its nuclear program is solely for peaceful purposes |
| 2007 | Bush, George Walker | |
13th Feb Beijing At a meeting with diplomats from the US, China  , South Korea , Russia, and Japan  , North Korea agrees to dismantle its nuclear facilities and allow international inspectors to enter the country in exchange for about $400 million in oil and aid |
