Final answer:
The United States has the highest population among North American countries.
Step-by-step explanation:
The statement about the population of North American countries that is correct is that the United States has the highest population among all North American countries.
As of 2021, the population of the United States is over 332 million people. It is followed by Mexico with a population of around 130 million and Canada with a population of around 38 million.
These population figures are based on official data and can change over time due to various factors such as birth rates, death rates, and migration.
Learn more about Population of North American countries