The first major Mesoamerican civilization is generally considered to be the Olmec civilization, which emerged around 1200 BCE in what is now southern Mexico. However, the timeline you mentioned includes several key developments in Mesoamerican history.
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Crossing the Bering Land Bridge: The first human migration to the Americas likely occurred around 15,000 years ago when people crossed the Bering Land Bridge from Asia to North America. This migration precedes the formation of Mesoamerican civilizations.
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Settlement in the Valley of Mexico: After migrating, various groups settled in regions such as the Valley of Mexico, leading to the development of complex societies.
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Agriculture: The transition to agriculture, particularly the cultivation of staple crops like maize, beans, and squash, was a crucial factor in the rise of Mesoamerican civilizations. This development allowed for settled communities and the growth of populations.
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Mayan Civilization: The Maya civilization emerged later, around 2000 BCE, with the building of cities and the establishment of social hierarchies, but it was not the first civilization in Mesoamerica.
In summary, while the Olmecs are often credited as one of the earliest civilizations in Mesoamerica, the emergence of complex societies followed the initial migrations and the significant advancement in agriculture. Each of the points you mentioned marks important milestones in the broader context of Mesoamerican history.