Truman was the only president to authorize nuclear weapons usage. It ended WW2.
He was the first and only President to authorize the use of nuclear weapons on an enemy force.
Harry Truman
George Bush was the first American president to unilaterally dismantle some US nuclear weapons. In 1991, he committed the U. S. to the destruction of some chemical weapons.
Ronald reagan
The US was the first to start testing nuclear weapons
The first nuclear weapons were developed in the united States under the Manhattan Proyect which made the first nuclear bombs.
The United States of America was the country that developed the first nuclear weapons.
The first Islamic country to have nuclear weapons was Pakistan.
Which President? US or UK. Since US is the first country to use nuclear weapons, then I assume that you are asking who was the US president during world war two while nuclear testing? Answer: Truman.
No, the President of the United States does not have a "red button" of any sort, in the Oval Office or elsewhere. Nuclear Missiles cannot be deployed from a direct command from the President; his command must be confirmed by the Secretary of Defence before the military take action. Note that the Secretary of Defence cannot authorize the launch of Nuclear Missiles without the President first doing so. Nicknamed the "Football", a black briefcase is carried with the President at all times. The briefcase is believed to contain nuclear codes and various pieces of equipment that authorize the deployment of Nuclear Missiles wherever the President is in the world; it functions as a mobile hub in the strategic defense system of the United States.
the first five countries that were involved in nuclear weapons are as follows;United StatesGermanyGreat BritainRussiaArgentina
1945