What did the us lead the world in the production of?

Nuclear power output

The US is the world's leading producer of nuclear power and the country accounts for over 30% of the world's demand for nuclear-generated electricity. In 2019, America's reactors generated 809 billion kilowatts of electricity, and another two reactors are in the making

Explanation:

there are a number of different ideologies that come into conflict with regard to immigrants and immigration to the us.

which time period is this? or is this story fictional, i'm going to need more info to answer this question