The primary reason the United States advocated the Open Door Policy was to%0D%0AResponses%0D%0A%0D%0A%0D%0AA%09protect and broaden U.S. trade with China.protect and broaden U.S. trade with China.%0D%0A%0D%0A%0D%0AB%09expand the concept of the Monroe Doctrine to Asia.expand the concept of the Monroe Doctrine to Asia.%0D%0A%0D%0A%0D%0AC%09justify our taking the Philippines as a US colony.justify our taking the Philippines as a US colony.%0D%0A%0D%0A%0D%0AD%09justify the extension of American colonies into the Far East.