Why were the Olmecs and Zapotects important?

The Olmecs, often regarded as the "mother culture" of Mesoamerica, were significant for their early advancements in art, architecture, and the development of a complex society around 1200 BCE. They are credited with creating the first known writing system in the Americas and influencing subsequent civilizations through their religious practices and artistic styles. The Zapotecs, emerging later in the Valley of Oaxaca, were important for their innovations in urban planning, exemplified by the city of Monte Albán, and for their contributions to early writing and calendar systems. Together, these cultures laid foundational elements that shaped the cultural and political landscapes of later Mesoamerican societies.