Answer:
building up its supply of military weapons
Explanation:
In order to preserve and safeguard the four freedoms in a democratic country like the United States, it has to build adequate military weapons to counter the aggressive and Fascist regimes. A strong military might will ensure the security of the US in case it has to deal with aggressors and dictators. President Franklin D Roosevelt spoke four freedoms amidst World War II when Germany was aggressively pursuing war and to impose dictatorial regime under Hitler.
