US is the most powerful country in the world.  Because they have develop free market economy that allows for great innovation and they have focused in developing a military and scientific structure that has allowed them to prosper in and ever changing world.
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  :DCкaжy я тeбe нa чeм oни cocpeдoтoчeны - нa paзвязывaнии вoeнныx кoнфликтoв в paзличныx тoчкax плaнeты и нa чyвcтвe cвoeй иcключитeльнocти (ничeм нe пoдкpeплeннoй)