(A) ** Open-Door Policy
(B) Colonialism
(C) Monroe Doctrine
(D) Roosevelt Corollary
EXPLANATIONS BELOW
Concept note-1: -The Open Door policy was a statement of principles initiated by the United States in 1899 and 1900. It called for protection of equal privileges for all countries trading with China and for the support of Chinese territorial and administrative integrity.
Concept note-2: -The Open Door Policy (Chinese: ) is the United States diplomatic policy established in the late 19th and early 20th century that called for a system of equal trade and investment and to guarantee the territorial integrity of Qing China.
Concept note-3: -U.S. Relations with China in the Age of Imperialism So, the U.S. supported an “Open Door” policy, which meant that China would have an “open door” to foreign investment and trade, but no nation would control it.
Concept note-4: -Hay proposed a free, open market and equal trading opportunity for merchants of all nationalities operating in China, based in part on the most favored nation clauses already established in the Treaties of Wangxia and Tianjin.