Why does akhil reed amar consider the writing of the constitution the hinge of history?

Akhil Reed Amar considers the writing of the Constitution the "hinge of history" because it marked a transformative moment in the establishment of a new political order in the United States, shaping the nation's identity and governance. The Constitution established foundational principles of democracy, individual rights, and federalism, influencing not only American society but also inspiring democratic movements globally. Amar argues that the Constitution's creation was pivotal in defining the relationship between the government and the governed, thus serving as a critical turning point in the trajectory of American history.