They wanted to present them as if they were gods. This was quite common in history and is a reason for example why pharaohs got pyramids built in their honor. The giant heads depicted their leaders as gods or someone who is in general larger than life itself. It was a sign of respect and others who would visit would also see this and know who they are dealing with. Such heads can still be found and examined which is important when trying to understand their ancient culture.
Complex societies are characterized by a large population living in an area, with an agricultural surplus which supports a healthy and growing population.
This eventually gives away to a clear distinction between various classes based on their jobs and wealth they possess. Again, this further gives rise to a culture, tradition and laws of the society to be developed.
However, neolithic communities of the stone ages were more simple in nature with the largest communities not more than a couple of hundred people, mostly from within the same extended family.
Farming was not abundant and many of these communities were scavengers and nomads who would travel in different seasons for better farming land.
Due to this, a complete complex society was able to develop in one place.
29. Oath
30. Pardons
31. Supreme Court justices
32. Inaugural speech (the name of this speech is « state of the union » but you don’t have to include that)