Big idea one: in Federalist 80, Hamilton stressed the need for the federal judiciary, rather than the state judiciaries or legislatures, to oversee a range of cases bearing upon the country as a whole, its sovereign status in international politics, or other matters of national importance.
Big idea two: Hamilton’s defense of the powers of the federal courts was cast in terms of the need to maintain peace, whether in the sense of international peace or of domestic tranquility. This implicated the privileges and immunities clause, which Hamilton described as the “basis of the union”