Refugees of Vietnamese people from the Vietnam War.
The correct answer is A. Olmec
They were the group of people that lived in the central and south America before all the more famous groups like Aztecs, Maya and Inca. They created the calendar that was used by those three later and many believe that they are the creators of the concept of zero.
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A historian using the historical thinking skill of examining historiography might want to pay close attention to how the thinking about a certain historical period has changed over time, in light of new evidence.
