I got this from Brittinica.com and these are the most important details from it:
'Open Door policy, statement of principles initiated by the United States in 1899 and 1900 for the protection of equal privileges among countries trading with China and in support of Chinese territorial and administrative integrity.The principle that all countries should have equal access to any of the ports open to trade in China. But after Japan’s defeat in World War II (1945) and the communist victory in China’s civil war (1949), which ended all special privileges to foreigners, made the Open Door policy meaningless.
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The Khmer Rouge in Cambodia was primarily a result of an extreme political ideology. Cambodians have Vietnamese influence and had desire to kick the French out. When their civilization suffers, they resorted to extremism.
The answer would be letter A.
It is a form of theatre ancient greece and a asia minor ...
Greek Tradegy is an extension of the ancient rites carried out in honor of dionysus, it heavily influenced the theatre of ancient rome and the renaissance
According to enotes.com, North Korea, Belarus, and Cuba all have command economies currently.