Chapter XIX of the United Nations Charter
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Chapter XIX of the United Nations Charter
United Nations Charter
The Charter of the United Nations is the foundational treaty of the international organization called the United Nations. It was signed at the San Francisco War Memorial and Performing Arts Center in San Francisco, United States, on 26 June 1945, by 50 of the 51 original member countries...

deals with ratification
Ratification
Ratification is a principal's approval of an act of its agent where the agent lacked authority to legally bind the principal. The term applies to private contract law, international treaties, and constitutionals in federations such as the United States and Canada.- Private law :In contract law, the...

 and signature of the UN Charter. It provided that the Charter would enter into force once ratified by the Permanent Five members of the UN Security Council and a majority of the other signatory states. The Charter was opened for signature on 26 June 1945 and entered into force on 24 October 1945, which became known as United Nations Day
United Nations Day
In 1947, the United Nations General Assembly declared 24 October, the anniversary of the Charter of the United Nations, as which "shall be devoted to making known to the peoples of the world the aims and achievements of the United Nations and to gaining their support for" its work.In 1971 the...

. In the meantime, the atomic bombings of Hiroshima and Nagasaki
Atomic bombings of Hiroshima and Nagasaki
During the final stages of World War II in 1945, the United States conducted two atomic bombings against the cities of Hiroshima and Nagasaki in Japan, the first on August 6, 1945, and the second on August 9, 1945. These two events are the only use of nuclear weapons in war to date.For six months...

took place on August 6 and 9, respectively; the introduction of this new weapon of warfare completed changed the security environment in which the UN Charter was promulgated.
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