The framers of the Constitution wrote the words "We the People" so much larger than the rest of the Preamble to emphasize the importance of this phrase and to draw attention to the fact that the Constitution was being created and adopted by the people themselves. The Preamble to the Constitution is a short introduction that explains the purpose and goals of the document, and it begins with the phrase "We the People of the United States, in Order to form a more perfect Union, establish Justice, insure domestic Tranquility, provide for the common defense, promote the general Welfare, and secure the Blessings of Liberty to ourselves and our Posterity, do ordain and establish this Constitution for the United States of America."
By writing "We the People" in larger letters than the rest of the Preamble, the framers of the Constitution were emphasizing that the Constitution was not being imposed on the people by a king or other authority, but rather that it was being created and adopted by the people themselves. This idea was central to the principles of democracy and self-governance that were central to the American Revolution, and the emphasis on "We the People" in the Preamble reflects the importance of these principles in the founding of the United States.