Question

To show that they had no intentions of acquiring territory, the United States and Great Britain:

joined the United Nations
adopted a policy of Imperialism
signed the Atlantic Charter
adopted the policy of containment

Answer 1

Signed The Alantic Charter

Answer 2

The United States and Great Britain during World War 2 (1939-1945) signed the Atlantic Charter that set a vision for the post-war world with support from 26 Allied Nations which became one of the first steps towards the establishment of the United Nations.
On 14th August 1941, The Atlantic Charter was issued by the then U.S president Franklin Roosevelt, and the British Prime minister, Winston Churchhill. It had broad statements of British and U.S war aims and affirmed the solidarity of the two against the Axis aggression and further laid a foundation for president Roosevelt vision for the post-war period; Free exchange of trade, disarmament, collective security, and self-determination.
The charter further served as an inspiration for thirds world countries that fought for independence i.e. Vietnam, Ghana