"Ahu" are stone platforms on which many moai sit. There are 313 known ahu and 125 of these carry moai. The biggest, Ahu Tongariki is 220 m (720 ft), and had the most (15) and tallest moai.
The arc of American history almost inevitably moves toward freedom. Whether it's Lincoln and the Emancipation Proclamation, the expansion of women's rights or, now, gay rights, I think there is an almost-inevitable march toward greater civil liberties.
