Early historians didn't have the technology modern historians had. So, they had less resources than more modern historians.
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Olmec Cities:
1200 BCE significant urban centres developed at San Lorenzo (the earliest), La Venta, Laguna de los Cerros, Tres Zapotes and Las Limas. San Lorenzo reached its peak of prosperity and influence between 1200 and 900 BCE when its strategic position safe from flooding allowed it to control local trade.
