The Atlantic Charter was a joint declaration signed by British Prime Minister Winston Churchill and US President Franklin D. Roosevelt on 14 August 1941, during World War II. The two leaders met aboard warships in Placentia Bay, Newfoundland, and issued the Charter as a statement of their shared vision for the post-war world.
The Charter outlined several key principles, including: no territorial aggrandisement, the right of peoples to self-determination, free trade, freedom of the seas, disarmament of aggressor nations, and the establishment of a broader system of international security. These principles later influenced the founding of the United Nations and inspired independence movements in colonised territories, including African and Asian nations that invoked the self-determination clause in their struggles against colonial rule.
The Atlantic Charter was signed during World War II, specifically before the United States formally entered the war (the US entered after the attack on Pearl Harbor in December 1941). The Vietnam War took place between 1955 and 1975. World War I ended in 1918, more than two decades before the Charter. The Cold War began after World War II ended in 1945.
The correct answer is World War II, during which the Atlantic Charter was signed as a statement of Allied war aims and post-war aspirations.