IMperialism and Open Door Policy By djmia2 1898 Open Door policy announced President McKinley wanted access to the Chinese market 1898 US gains Philippines, Guam and Puerto Rico after Spanish-American War 1900 Boxer rebellion Chinese nationalists rebelled against foreign occupation in their country 1915 Japan violated policy Japan presented Twenty One Demands to China 1937 China and Japan go to war 1941 Japan enters WWII against US This ends the policy