It can be deduced that the author developed the central idea about the importance of the bridge by stating that it connected the Andean people that were isolated before.
A central idea simply means the main idea that's in a story. It's the information that the author wants to convey to the readers.
In this case, the author developed the central idea of the text about the significance of the Q’eswachaka bridge as it was stated that the suspension bridge connected Andean people who were previously isolated from each other.
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