Final answer:
The Olmec civilization used rammed earth platforms for their temples and palaces, indicating a sophisticated culture with a defined elite.
Step-by-step explanation:
The civilization that used rammed earth platforms for their temples and palaces was the Olmec civilization. The Olmecs, known to shape their culture with clearly defined elites controlling large labor forces, constructed great earthen platforms and step pyramids that demonstrated their sophisticated culture. These structures were likely reserved for the elite and used for ceremonial purposes, with most workers living beyond these central zones. The construction techniques of the Olmecs were influential, with later civilizations such as the Maya also creating remarkable architecture in their cities.