The correct answer is China; United States; North Korea; South Korea
The Korean War was a military conflict that took place between the years 1950 to 1953. On the one hand, North Korea supported by China, and on the other, South Korea, with support from the United States (USA) and the US forces. of the United Nations.
Until 1945 Korea was a Japanese-dominated territory, when Japan was defeated in World War II and signed its surrender, the USA and the former USSR at that time the main world nations, then granted autonomy and sovereignty to the Koreans and Korea .
Korea is separated by the 38 ° parallel, as established at the Potsdam Conference. This demarcation divides Korea into two opposing political systems: South Korea (Republic of Korea), capitalist under the influence of the USA, and North Korea (Democratic People's Republic of Korea), communist, supported by the Soviet Union.
D.) taking a diplomatic or legislative action to force the European powers to negotiate with the United States
At the peak of the Roman Empire's reach, around A.D. 117, the Empire stretched as far north as modern Scotland, stretched down through Europe east into Asia as far as the border between modern day Iraq and Iran, with its southern reaches extending into northern Africa.
I'm sorry I just really need some points :(
Because they had many ways of doing things and were a very intelligent society.
-Hope it helps.