Which of the following was a factor in the united states dominating the world economy after world war 2

The correct option is this: THE UNITED STATES WAS MOSTLY UNTOUCHED BY THE WAR. 
The World War ll was fought mostly in Asia and Europe. The war was a very expensive project for all the countries involved, in term of money and human lives, but the two countries who suffered most were Germany and Japan, while American paid dearly in the war too, it managed to come out of the war more powerful as a result of other countries' decline.

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