Then rather than asking silly questions as to whether the Constitution authorizes specific foreign policy expedients (like spreading democracy), you should acknowledge the truth of your own statement: that the Constitution does not restrict the Federal government from pursuing such a policy but leaves the details of foreign policy to the discretion of those it empowers to act.
I do acknowledge that. My question was rhetorical. Your post seemed to indicate that the Constitution ENCOURAGED the US to spread democracy.
Jeez.