The correct answer is Great Zimbabwe
These buildings were sometimes even over 5 meters long and were made out of bricks that were stacked on top of each other. The constructions are huge and there are many anthropologists who claim that these constructions are second in their greatness only to the great pyramids in Egypt because of how massive and unique they are.
The final solution was the Nazis' answer to a problem that they didn't have. It consisted of demonizing and persecuting people they didn't like, and then working them, starving them, and killing them. Roughly six million Jews died during the Nazi Holocaust.
Enslave the Natives. That is a big one.
Freedom of speech, right to bare arms, and the 18th amendment that allows blacks and whites in the same school