At present, there are two views: but it is not the gdp you mentioned, because it is very old, and the evaluation system at that time was the total industrial output value.

One is 1894, and the United States has surpassed Britain to become the world's total industrial output value.

First, in the 1980s of 19, the United States surpassed Britain to become the world's total industrial output value.

As for the first gdp, in fact, since the theory of gdp was put forward in the 20th century, the United States has always been the first in gdp.

As for what they said, 1972, I would like to ask who was the first before America became the first.