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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Because the u.s dropped an atomic bomb into the middle of japan and threaten to do another one
The Himalayas mountain range
By the 1700's Austria and Spain were in conflict with each other over territory in Italy.
Hope this helps you! :-)
