The population numbers are wrong. There are 325 million, not billion, people in the USA. China has 1 billion people, There are 7 billion people in the word, expected to be 8 billion by 2025.
And that's just the OBSERVABLE universe, aka "whatever we can see from Earth at the moment." So it could be bigger. Or we could be one of many universes in a multiverse.
The population numbers are wrong. There are 325 million, not billion, people in the USA. China has 1 billion people, There are 7 billion people in the word, expected to be 8 billion by 2025.