It's right in the preamble. "We the people of the United States... do ordain and establish this Constitution for the United States of America" All powers, inc

It's right in the preamble. "We the people of the United States... do ordain and establish this Constitution for the United States of America" All powers, including the power to establish the Constitution in the first place, are derived from the people. Section 8 explicitly lays out which powers we the people are granting to the government: borrow money, regulate commerce with foreign nations, establish a post office, etc. If powers are not explicitly granted to the government, it doesn't have them.