Answer:
The reason why president Roosevelt and prime minister Churchill wanted to create the declaration of liberated was because they wanted to limit the power of Joseph Stalin and the power of soviet union.
Step-by-step explanation:
The reason why Joseph Stalin was such a threat to President Roosevelt and Prime minister Churchill because Joseph Stalin wanted European countries to become a communist country.
To avoid such thing both the president and prime minister suggested that European countries become democratic nations. They being democratic nations there would be less way where communism could spread.