A more thorough explanation:

Term: postnatus
Definition: Postnatus refers to a person who was born after a significant political event that impacted their political rights. This term is commonly used to describe individuals born after the Declaration of Independence. The plural form of postnatus is postnati. This term is the opposite of antenatus, which refers to individuals born before a significant political event.
Examples: A person born in the United States after July 4, 1776, is considered a postnatus. Similarly, a person born in India after August 15, 1947, is also a postnatus. These examples illustrate how postnatus is used to describe individuals born after a significant political event that impacted their political rights.