From Leucippus in 500 BC postulating the theory of atoms and void, to Einstein's theory of relativity.
In the 1930s, key discoveries are made about the fissioning of atoms by Enrico Fermi, Otto Hahn,
Fritz Strassmann and Lise Meitner. These discoveries lay the groundwork for the development of nuclear weapons in the next decade.
The United States' Manhattan Project builds and tests the first atomic bombs. The new weapons are used on Hiroshima,
then Nagasaki leading to the end of World War II. The beginning of the Cold War follows with the USSR's detonation of an atomic bomb in 1949.
Year: 1940 | 1941 | 1942 | 1943 | 1944 | 1945 | 1946 | 1947 | 1948 | 1949
The Korean War opens this decade, which also sees the first space travel by human beings, the construction of bomb shelters,
and the deployment of the first Intercontinental Ballistic Missiles by the United States in 1958.
Year: 1950 | 1951 | 1952 | 1953 | 1954 | 1955 | 1956 | 1957 | 1958 | 1959
France and China join the "Nuclear Club." The Cuban Missile Crisis brings the world to the brink of a nuclear war and back.
In 1968, the unpopular war in Vietnam and social demonstrations rising across the world, present the backdrop for the Non-Proliferation
Treaty, in which the nuclear powers promise to bring about complete nuclear disarmament.
Year: 1960 | 1961 | 1962 | 1963 | 1964 | 1965 | 1966 | 1967 | 1968 | 1969
The SALT I and Anti Ballistic Missile (ABM) Treaties open this decade on a positive note.
The end of the Vietnam War is followed by the SALT II agreement. The tragic accident at the Three Mile Island
nuclear energy plant occurs at the end of the decade.
Year: 1970 | 1971 | 1972 | 1973 | 1974 | 1975 | 1976 | 1977 | 1978 | 1979
The Cold War is at its height with Ronald Reagan declaring the USSR "the Evil Empire." Reagan's Administration engineers a
massive build-up of nuclear arms. In 1985, it is revealed that Israel may have up to 200 nuclear weapons stockpiled.
By the end of the decade, the Cold War ends when Glasnost exploded into a mostly peaceful revolution across the former-Soviet block.
Year: 1980 | 1981 | 1982 | 1983 | 1984 | 1985 | 1986 | 1987 | 1988 | 1989
The promise of nuclear disarmament after the Cold War got a boost when Ukraine, Kazahkstan, and Belarus chose to give up their
nuclear arsenals inherited from the former Soviet Union. However, other nuclear weapons states do not follow suit.
By the end of the decade, two other countries, India and then Pakistan, test nuclear weapons.<
Year: 1990 | 1991 | 1992 | 1993 | 1994 | 1995 | 1996 | 1997 | 1998 | 1999
This decade begins with threats by the United States to proceed with a nationwide missile defense system,
even if this means abrogating the 1972 Anti-Ballistic Missile Treaty.
Year: 2000 | 2001 | 2002 | 2003 | 2004 | 2005 | 2006 | 2007 | 2008 | 2009
The decade started with a resurgence of international discussion about nuclear weapons issues.
Year: 2010 | 2011 | 2012 | 2013 | 2014 | 2015 | 2016