Final answer:
The principle that 'all men are created equal' is not established in Article I, Section 9 of the Constitution. It is found in the preamble of the Declaration of Independence.
Step-by-step explanation:
The clause that establishes the principle that 'all men are created equal' can be found in the Declaration of Independence, not in Article I, Section 9 of the Constitution. The famous phrase 'all men are created equal' is found in the preamble of the Declaration of Independence, which was drafted by Thomas Jefferson and adopted by the Second Continental Congress in 1776. It is important to note that at the time, this phrase referred to white males and did not include African-Americans, Native Americans, or women