In the year 1913, the United States was producing as much as a third of the industrial output of the entire world which was more than Britain, France, and Germany, combined.
Just before the first World War erupted, a statistic was shared that showed the world that the U.S. were now the foremost industrial power in the world.
As of 1913, the United States boasted of producing about a third of the entire industrial output in the whole world.
This was astounding because it was more than the combined output of the European powers of France, Germany, and Britain.
The reason it happened was that the U.S. had access to a lot of resources, and immigration had led to a population boom that allowed productivity to increase to massive levels.
In conclusion, the answer is Britain, Germany, and France combined.
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