Final answer:
The main message of the Atlantic Charter was that nations had the right to choose their government.
Step-by-step explanation:
The main message of the Atlantic Charter was that nations had the right to choose their government. It was a joint statement issued by the United States and Great Britain in 1941, during World War II. The charter laid out the principles for post-war international cooperation and called for self-determination and the respect for the sovereignty of all nations.
Learn more about The Atlantic Charter