(A) Monroe Doctrine
(B) ** Open Door Policy
(C) social darwinism
(D) laissez faire
EXPLANATIONS BELOW
Concept note-1: -The Open Door Policy was a policy between China, the US, Japan, and several European powers that stated each of those countries should have equal access to Chinese trade. It was created in 1899 by US Secretary of State John Hay and lasted until 1949, when the Chinese civil war ended.
Concept note-2: -What was the Open Door policy? 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-3: -The eight nations’ spheres in Qing China were designated primarily for trade purposes. Great Britain, France, the Austro-Hungarian Empire, Germany, Italy, Russia, the United States, and Japan each had exclusive special trading rights, including low tariffs and free trade, within Chinese territory.