Answer: its
Explanation: The correct pronoun would be its instead of “it’s” or “it”because “it’s” is an abbreviation of it is and it is representing object. The answer is not “their” because “their” is plural.
Are You asking whether this is true?
This is true.
George Washington became a president in 1789. He participated in the creation of the constitution, which was ratified in 1788, and it came into force in 1789 - the year when George Washington took the office.
