Changes of mind and thoughts?
Use care with secondary clauses. Use active voice. Use powerful verbs. Follow grammar rules
Formal language is most preferred.
Answer:
His actions led to a competition between the two cities to have the most overpowering wall, and to the weakening of their populations.
Explanation:
The Mandarin not only establishes the main conflict by claiming that the city of Kwan-Si building a wall in the shape of a pig would be a threat to their orange shaped city; he also decided to ask for advice and follow the call of the whisper to shape their wall as a stick that could hurt the pig.