USA attacked Iraq on the plea that it is developing WMD and it has connections with Al Quida. Both allegations were wrong. USA considers itself the policeman of the world. Even in modern age, Might is Right. No one can question it. It attacked Afganistan after 9/11, but told India not to attack Pakistan, which is the grooming ground of Islamic terrorists creating problems in India.
It is the only developed country, which did not sign the Kyoto agreement on environment, though it wastes the maximum energy on per capita basis, many times the consumption in even other developed countries.
It does not support democracy in developing nations. It decides how to treat democracy or autocracy on the basis of its own selfish requirement. It does not hv permanent friends in developing countries, except Israel, as Jews control the economy of US. It had friendship with Saddam Husain, Taliban etc, when it suited US.