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Preparation for defense is an inalienable prerogative of a sovereign state.

Roosevelt, Franklin D. (Franklin Delano) (1943). “Development of United States Foreign Policy: Addresses and Messages of Franklin D. Roosevelt Compiled from Official Sources, Intended to Present the Chronological Development of the Foreign Policy of the United States from the Announcement of the Good Neighbor Policy in 1933, Including the War Declarations”
Preparation for defense is an inalienable prerogative of a sovereign state.