One country, one constitution, one destiny.

The line encapsulates a nationalist, Unionist political creed: the United States is a single political community (“one country”) governed by a single fundamental legal framework (“one constitution”), and therefore bound to a shared historical future (“one destiny”). Attributed to Daniel Webster, it aligns closely with his well-known arguments against nullification and secession and his insistence that the Constitution created a government of the people rather than a mere compact among sovereign states. The triadic phrasing gives it the force of a slogan, compressing constitutional theory into a memorable affirmation of unity and permanence.