The Incas were ancient (modern) people
The Inca civilization is known to be one that came to its boom in ancient Peru and it is one that exist between c. 1400 and 1533 CE.
Note that the empire was said to be extended across western South America.
Looking at the above, the opposite in meaning and the correct terms that fit into the text above is written below.
The Incas were ancient (modern) people
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