Easy. In Hamilton's day, the US needed a more powerful federal government. Even Hamilton's arch-enemy Thomas Jefferson admitted as much as soon as he became President. The US Military Academy, US Navy, the Louisiana Purchase, a national bank, were all very controversial at the time. Today, everyone sober concedes that Hamilton's Federalists were correct.
I’ll concede that many things, that many believe made America great, may yet prove to be our undoing.