From 1945 until the late 1970s or early 1980s the United States always had the most nuclear weapons. After then the USSR/Russia has had the most nuclear weapons.
from 1945 until the 1980s, the US.since the 1980s, the USSR and now Russia.
Without a doubt, the US. This was true from 1945 until the mid-1980s, when the USSR passed the US. Russia still has the most today.
In the late 1980s it peaked at somewhere over 20,000 warheads. As of 2012 the total has declined to roughly 10,000 warheads.
chernobyl
Chemical weapons were used in Iraq in the 1970s and 1980s to attack Kurds living in the North of the country as part of an intentional genocide against the Kurdish people. In addition, these weapons were also used by Iraq against the Iranians during the Iran-Iraq War.
The Chernobyl disaster
Because it was changing people's DNA
in the 1980s he supplied the IRA with weapons and explosives
Chernobyl, in the Ukraine, was the site of a nuclear reactor fire and radiation leak on April 26, 1986.
Soviet Union
Using nuclear energy is possible, and in fact being done. It has been done since the 1940s. The first nuclear electric plant came on line some time after that, but I worked at one in the 1980s.