The Maya developed their first complex societies during the Preclassic period (2000 BCE-250 CE). Archaeological evidence from sites like Cuello in Belize indicates early Maya settlements dating to approximately 1200 BCE, though some scholars suggest even earlier dates. During this formative era, the Maya established agricultural practices centering on maize, beans, and squash, built increasingly sophisticated ceremonial architecture at sites like Nakbe and El Mirador, and developed early writing systems, calendars, and complex religious practices that would form the foundation of later Maya civilization.