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the nations should be open for trade and commerce. have equal trading rights in China
They should be, at least in countries/nations which have equal rights of men and women.
because they are stupid
Yes--by formally protesting against the governments of countries that regularly violate human rights, whether of their own citizens or the citizens of other nations. The U.S. Congress and the federal courts should also take measures against their own country's administration for the violations of the Geneva conventions (one example is in the policies and treatment towards Guantanamo detainees). The U.S. government, as well as foreign nations, should not be allowed to be exempted from the treaties of the Geneva Conventions.
The declaration stated that all people have certain human rights that should be respected by ''all peoples and all nations.''
That depends upon who your partner nations are. Some nations respect human rights and some don't. Your expectations should be adjusted accordingly.
The wealthy nations gain market expansion, if they are wise enough to see the potential. Therefore they should invest in the economic advancement of the poor nations
No, developed nations aren't forced to help the poorer ones.
The Monroe Doctrine was the policy that said that European nations should not interfere with America.
what did gorbachev say in his speech in 1992 should be done to the united nations
Any answer to this question would be pure opinion, but I sincerely believe that nations should not have the freedom to develop nuclear weapons. The more nations that have them, the more likely it becomes that they will be used.
Since the League of Nations is now defunct, there is probably no reason for them to now.